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Executive Employment Agreement - NUMAR Corp., Halliburton Co., and Edward P. Delson

                        EXECUTIVE EMPLOYMENT AGREEMENT


     This Executive Employment Agreement ('Agreement'), including the attached
Exhibits 'A' and 'B', is entered into by and between NUMAR Corporation, a
Pennsylvania corporation having offices at 508 Lapp Road, Malvern, Pennsylvania
19355 ('Employer'), Halliburton Company, a Delaware corporation having offices
at 3600 Lincoln Plaza, 500 N. Akard Street, Dallas, Texas 75201-3391
('Halliburton'), and Edward P. Delson, an individual currently residing at
1004 Stonebridge Road, Lower Gwyneed, PA 19002 ('Employee'), to be effective at
the effective date that Employer becomes a subsidiary of Halliburton (the
'Effective Date').

                             W I T N E S S E T H:

     WHEREAS, Halliburton Company has proposed to acquire Employer as a
subsidiary of Halliburton; and

     WHEREAS, Employee is currently employed by Employer; and

     WHEREAS, Employer is desirous of continuing the employment of Employee
after the effective date that Employer becomes a subsidiary of Halliburton
pursuant to the terms and conditions and for the consideration set forth in this
Agreement, and Employee is desirous of continuing in the employ of Employer
pursuant to such terms and conditions and for such consideration.

     NOW, THEREFORE, for and in consideration of the mutual promises, covenants,
and obligations contained herein, Employer and Employee agree as follows:

ARTICLE I: EMPLOYMENT AND DUTIES:

     1.1. Employer agrees to employ Employee, and Employee agrees to be employed
by Employer, beginning as of the Effective Date and continuing until December
31, 2000 (the 'Term'), subject to the terms and conditions of this Agreement.

     1.2. Beginning as of the Effective Date, Employee shall be employed as
Senior Vice President and Chief Financial Officer of Employer. Employee agrees
to serve in the assigned position and to perform diligently and to the best of
Employee's abilities the duties and services appertaining to such position as
reasonably determined by Employer, as well as such additional or different
duties and services appropriate to such position which Employee from time to
time may be reasonably directed to perform by Employer. Employee shall at all
times comply with and be subject to such policies and procedures as Employer or
Halliburton may establish from time to time, including, without limitation,
Halliburton's Code of Business Conduct.

 
     1.3. Employee shall, during the period of Employee's employment by
Employer, devote Employee's full business time, energy, and best efforts to the
business and affairs of Employer. Employee may not engage, directly or
indirectly, in any other business, investment, or activity that interferes with
Employee's performance of Employee's duties hereunder, is contrary to the
interest of Employer or its affiliates, or requires any significant portion of
Employee's business time. The foregoing notwithstanding, the parties recognize
and agree that Employee may engage in passive personal investments and other
business activities which do not conflict with the business and affairs of the
Employer or its affiliates or interfere with Employee's performance of his
duties hereunder. Employee may not serve on the board of directors of any entity
other than the Employer during the Term without the approval of the Audit
Committee of Halliburton's Board of Directors in accordance with Halliburton's
policies and procedures regarding such service, which approval will not be
unreasonably withheld. Employee shall be permitted to retain any compensation
received for service on any unaffiliated corporation's board of directors.

     1.4. Employee acknowledges and agrees that Employee owes a fiduciary duty
of loyalty, fidelity and allegiance to act at all times in the best interest of
the Employer to do no act which would intentionally injure Employer's business,
its interests, or its reputation. It is agreed that any direct or indirect
interest in, connection with, or benefit from any outside activities,
particularly commercial activities, which interest might in any way adversely
affect Employer, or any of its affiliates, involves a possible conflict of
interest. In keeping with Employee's fiduciary duties to Employer, Employee
agrees that Employee shall not knowingly become involved in a conflict of
interest with Employer or its affiliates, or upon discovery thereof, allow such
a conflict to continue. Moreover, Employee agrees that Employee shall disclose
to the Audit Committee of Halliburton's Board of Directors any facts which might
involve a possible conflict of interest.

ARTICLE 2: COMPENSATION AND BENEFITS:

     2.1. Employee's base salary during the Term shall be not less than $170,000
per annum which shall be paid in accordance with the Employer's standard payroll
practice for its executives.

     2.2. Beginning January 1, 1998 and continuing for the remainder of the
Term, Employee shall participate in an incentive compensation plan adopted by
the Board of Directors of Employer for senior executives of Employer, subject to
approval of such plan in accordance with Halliburton's policies and procedures
as in effect from time to time. Such plan shall provide that Employee shall have
an opportunity to earn an annual incentive bonus of up to 40% of his base salary
if the objectives of such plan, as established by the Board of Directors of
Employer in its complete discretion on an annual basis, are achieved in full.
The foregoing notwithstanding, nothing herein shall prevent or prohibit Employer
from 

                                       2

 
modifying such incentive compensation plan or replacing such plan with a
substitute incentive compensation plan, as provided in Section 2.7 hereof.

     2.3. As of the Effective Date and in consideration of the promises
contained herein, Halliburton shall grant to Employee under the Halliburton
Company 1993 Stock and Long-Term Incentive Plan a nonqualified stock option to
purchase 7,500 shares of Halliburton's common stock, subject to the approval by
the Compensation Committee of Halliburton's Board of Directors or its delegate.
The form and other terms and conditions of such option (other than the exercise
price, which shall be the closing price of Halliburton's common stock on the New
York Stock Exchange on the Effective Date) are set forth in Exhibit A attached
to, and forming a part of, this Agreement.  In addition, as of the Effective
Date and subject to the approval of the Compensation Committee of Halliburton's
Board of Directors or its delegate, Halliburton shall grant to Employee under
the Halliburton Company 1993 Stock and Long-Term Incentive Plan 3,000 shares of
Halliburton's common stock subject to the restrictions and other terms and
conditions set forth in Exhibit B attached to, and forming a part of, this
Agreement.

     2.4. As of the Effective Date, Employee shall continue to be entitled to
all his rights under outstanding stock options held by Employee prior to the
Effective Date, and nothing herein shall or is intended to affect any of such
rights.

     2.5. From and after the Effective Date, Employer shall pay, or reimburse
Employee, for all ordinary, reasonable and necessary expenses which Employee
incurs in performing his duties under this Agreement including, but not limited
to, travel, entertainment, professional dues and subscriptions, and all dues,
fees and expenses associated with membership in various professional, business
and civic associations and societies of which Employee's participation is in the
best interest of Employer.

     2.6. While employed by Employer, Employee shall be allowed to participate,
on the same basis generally as other employees of Employer, in all general
employee benefit plans and programs, including improvements or modifications of
the same, which on the Effective Date or thereafter are made available by
Employer to all or substantially all of Employer's executive employees. Such
benefits, plans, and programs may include, without limitation, medical, health,
and dental care, life insurance, disability protection, and qualified retirement
plans but, except as otherwise provided in Section 2.2 and in the last sentence
of this Section 2.6, shall not include any incentive compensation or bonus plans
or programs. Except as specifically provided herein, nothing in this Agreement
is to be construed or interpreted to provide greater rights, participation,
coverage, or benefits under such benefit plans or programs than provided to
executive employees pursuant to the terms and conditions of such benefit plans
and programs. While employed by Employer, Employee shall be eligible to receive
grants of stock options under the Halliburton Company 1993 Stock and Long-Term
Incentive Plan and any other stock option plans adopted by Halliburton.

                                       3

 
     2.7. Neither Employer nor Halliburton shall by reason of this Article 2 be
obligated to institute, maintain, or refrain from changing, amending, or
discontinuing, any incentive compensation or employee benefit program or plan,
so long as such actions are similarly applicable to covered employees generally.

     2.8. Employer may withhold from any compensation, benefits, or amounts
payable under this Agreement all federal, state, city, or other taxes as may be
required pursuant to any law or governmental regulation or ruling.

ARTICLE 3:  TERMINATION PRIOR TO EXPIRATION OF TERM AND EFFECTS OF SUCH
            TERMINATION:

     3.1. Employee's employment with Employer shall be terminated (i) upon the
death of Employee, (ii) upon Employee's permanent disability (permanent
disability being defined as Employee's physical or mental incapacity to perform
his usual duties as an employee with such condition likely to remain
continuously and permanently), or (iii) at any time during the Term by Employer
upon notice to Employee or by Employee upon 60 days' notice to Employer for any
or no reason; provided, however, that Employer shall not terminate Employee's
employment for any reason, except for 'Cause' (as hereinafter defined), prior to
six (6) months following the Effective Date.

     3.2. If Employee's employment is terminated by reason of a 'Voluntary
Termination' (as hereinafter defined), the death of Employee, permanent
disability of Employee (as defined in Section 3.1) or by the Employer for Cause,
all future compensation to which Employee is otherwise entitled and all future
benefits for which Employee is eligible shall cease and terminate as of the date
of termination, except as specifically provided in this Section 3.2. Benefits
payable to Employee pursuant to the plans, programs or stock option and
restricted stock agreements specified or referred to in Sections 2.2, 2.3 or 2.4
shall be made in accordance with such plans, programs, stock option and
restricted stock agreements and the provisions of such Sections; provided,
however, that if Employee's employment with Employer shall terminate by reason
of early retirement with the consent of Employer, which will not be unreasonably
withheld, at or after attaining age 62, Employer will pay to Employee as a
retirement benefit an amount equal to the value of any shares of restricted
Halliburton common stock (based upon the closing price of Halliburton's common
stock on the New York Stock Exchange on the retirement date) which were granted
to Employee pursuant to Section 2.3 and which are forfeited as a result of
Employee's termination.  Employee, or his estate in the case of Employee's
death, shall be entitled to pro rata base salary through the date of such
termination and shall be entitled to any individual bonuses or individual
incentive compensation not yet paid but due under Employer's plans but shall not
be entitled to any other payments by or on behalf of Employer except for those
which may be payable pursuant to the terms of Employer's employee benefit plans
(as hereinafter defined).  For purposes of this Section 3.2, a 'Voluntary
Termination' of the employment relationship by Employee

                                       4

 
prior to expiration of the Term shall be a termination of employment in the sole
discretion of and at the election of Employee, other than (i) a termination of
Employee's employment because of a material breach by Employer of any material
provision of this Agreement which remains uncorrected for thirty (30) days
following written notice of such breach by Employee to Employer or (ii) a
termination of Employee's employment within six (6) months of a change in
Employee's title to a less senior position, material reduction in his
responsibility with Employer or requirement for Employee to be based at a
location outside a 60-mile radius of Malvern, Pennsylvania. For purposes of this
Section 3.2, the term 'Cause' shall mean any of (i) Employee's willful
misconduct in the performance of the duties and services required of Employee
pursuant to this Agreement that has a material adverse effect on Employer; (ii)
Employee's final conviction of a felony; (iii) Employee's material breach of any
material provision of this Agreement which remains uncorrected for thirty (30)
days following written notice to Employee by Employer of such breach which
specifies the basis for the breach in detail; (iv) a material violation of
Halliburton's Code of Business Conduct; or (v) Employee's breach of the
Affiliate's Agreement between Employee and Halliburton dated June __, 1997.  No
act or failure shall be deemed 'willful' if due primarily to an error in
judgment or negligence or if in good faith and with reasonable belief that such
act is in the best interest of Employer.

     3.3. If Employee's employment is terminated for any reason other than as
described in Section 3.2 above during the Term, (i) all of Employee's
outstanding options to purchase shares of Halliburton common stock granted
pursuant to Section 2.3 hereof shall vest and become immediately exercisable,
(ii) all Forfeiture Restrictions (as defined in Exhibit B hereto) shall lapse
with respect to the Restricted Shares (as defined in Exhibit B hereto) granted
pursuant to Section 2.3 hereof, and (iii) Employer shall continue to pay to
Employee as a severance benefit his base salary at the rate in effect on the
date of Employee's termination of employment for the remainder of the unexpired
Term; provided, however, that the aggregate amount of such payments shall not be
less than $170,000.  The severance benefit paid pursuant to this Section 3.3 to
Employee shall be in consideration of Employee's continuing obligations
hereunder after such termination (including, without limitation, Employee's 
non-competition obligations). Employee shall not be under any duty or obligation
to seek or accept other employment following a termination of employment
pursuant to which severance benefit payments under this Section 3.3 are owing
and the amounts due Employee pursuant to this Section 3.3 shall not be reduced
or suspended if Employee accepts subsequent employment or earns any amounts as a
self-employed individual.

     Employee's rights under this Section 3.3 are Employee's sole and exclusive
rights against the Employer or its affiliates and the Employer's sole and
exclusive liability to Employee under this Agreement, in contract, tort or
otherwise, for the termination of his employment relationship with Employer.
Employee covenants not to sue or lodge any claim, demand or cause of action
against Employer based upon Employee's termination of employment for any monies
other than those specified in this Section 3.3 and except for any 

                                       5

 
claims Employee may have for benefits under the plans, programs and stock option
and restricted stock agreements specified or referred to in Sections 2.2, 2.3 or
2.4. If Employee breaches this covenant, Employer shall be entitled to recover
from Employee all sums expended by Employer (including costs and attorneys'
fees), in connection with such suit, claim, demand or cause of action. Nothing
contained in this Section 3.3 shall be construed to be a waiver by Employee of
any benefits accrued for or due Employee under any employee benefit plan (as
such term is defined in the Employees' Retirement Income Security Act of 1974,
as amended) maintained by Employer, except that Employee shall not be entitled
to any severance benefits pursuant to any severance plan or program of the
Employer or Halliburton.

     3.4. Termination of the employment relationship does not terminate those
obligations imposed by this Agreement which are continuing obligations,
including, without limitation, Employee's obligations under Articles 4 and 5.

ARTICLE 4: OWNERSHIP AND PROTECTION OF INTELLECTUAL PROPERTY AND CONFIDENTIAL
           INFORMATION:

     4.1. All information, ideas, concepts, improvements, discoveries, and
inventions, whether patentable or not, which are conceived, made, developed or
acquired by Employee, individually or in conjunction with others, during
Employee's employment by Employer (whether during business hours or otherwise
and whether on Employer's premises or otherwise) which relate to Employer's
business, products or services (including, without limitation, all such
information relating to corporate opportunities, research, financial and sales
data, pricing and trading terms, evaluations, opinions, interpretations,
acquisition prospects, the identity of customers or their requirements, the
identity of key contacts within the customer's organizations or within the
organization of acquisition prospects, or marketing and merchandising
techniques, prospective names, and marks), and all writings or materials of any
type embodying any of such items, shall be the sole and exclusive property of
Employer.

     4.2. Employee acknowledges that the businesses of Employer and its
affiliates are highly competitive and that their strategies, methods, books,
records, and documents, their technical information concerning their products,
equipment, services, and processes, procurement procedures and pricing
techniques, the names of and other information (such as credit and financial
data) concerning their customers and business affiliates, all comprise
confidential business information and trade secrets which are valuable, special,
and unique assets which Employer or its affiliates use in their business to
obtain a competitive advantage over their competitors.  Employee further
acknowledges that protection of such confidential business information and trade
secrets against unauthorized disclosure and use is of critical importance to
Employer and its affiliates in maintaining their competitive position. Employee
hereby agrees that Employee will not, at any time during or after his employment
by Employer, make any unauthorized disclosure of any confidential business
information or 

                                       6

 
trade secrets of Employer or its affiliates, or make any use thereof, except in
the carrying out of his employment responsibilities hereunder. Confidential
business information shall not include information in the public domain (but
only if the same becomes part of the public domain through a means other than a
disclosure prohibited hereunder). The above notwithstanding, a disclosure shall
not be unauthorized if (i) it is required by law or by a court of competent
jurisdiction or (ii) it is in connection with any judicial or other legal
proceeding in which Employee's legal rights and obligations as an employee or
under this Agreement are at issue; provided, however, that Employee shall, to
the extent practicable and lawful in any such events, give prior notice to
Employer of his intent to disclose any such confidential business information in
such context so as to allow Employer an opportunity (which Employee will not
oppose) to obtain such protective orders or similar relief with respect thereto
as it may deem appropriate.

     4.3. All written materials, records, and other documents made by, or coming
into the possession of, Employee during the period of Employee's employment by
Employer which contain or disclose confidential business information or trade
secrets of Employer or its affiliates shall be and remain the property of
Employer, or its affiliates, as the case may be. Upon termination of Employee's
employment by Employer, for any reason, Employee promptly shall deliver the
same, and all copies thereof, to Employer.

ARTICLE 5: POST-EMPLOYMENT AND NON-COMPETITION
           OBLIGATIONS:

     5.1. As part of the consideration for the compensation and benefits to be
paid to Employee hereunder, and as an additional incentive for Employer to enter
into this Agreement, Employer and Employee agree to the non-competition
provisions of this Article 5.  During the term of Employee's employment and for
two (2) years after any termination of employment, or if longer, for so long as
Employee is entitled to the payment of amounts determined in accordance with
Section 3.3 hereof, Employee shall not directly or indirectly:  (i) engage
anywhere in the world, in (a) the manufacture, assembly, design, development,
distribution or marketing of or research with respect to any product, equipment
or service substantially similar to or in competition with any product,
equipment or service which at any time during the term of such employment or the
immediately preceding twelve-month period has been manufactured, sold,
distributed or provided by Employer or any product, equipment or service which
Employer was developing during such period for future manufacture, sale or
distribution or (b) the provision of any service substantially similar to or in
competition with any service offered by Employer at any time during such period;
(ii) be or become a stockholder, partner, owner, officer, director or employee
or agent of, or a consultant to, or give financial or other assistance to, any
person or entity considering engaging in any such activities or so engaged;
(iii) seek in competition with the business of Employer to procure orders from
or do business with any customer of Employer; (iv) solicit, or contact with a
view to the engagement or employment of, any person who is an employee of
Employer; (v) seek to contract with or engage (in such a way as to adversely
affect or 

                                       7

 
interfere with the business of Employer) any person or entity who has been
contracted with or engaged to manufacture, assemble, supply or deliver products,
goods, materials or services to Employer; or (vi) engage in, or participate in
any effort to act to induce any of the customers, associates, consultants, and
employees of Employer or any of its affiliates to take, any action which might
be disadvantageous to Employer or any of its affiliates; provided, however, that
nothing herein shall prohibit the Employee and his affiliates from owning, as
passive investors, in the aggregate not more than 5% of the outstanding 
publicly-traded stock of any corporation so engaged. The duration of the
Employee's covenants set forth in this Section 5.1 shall be extended by a period
of time equal to the number of days, if any, during which the Employee is in
violation of the provisions hereof.

     The term 'Employer' as used in this Section 5.1 shall mean and include (i)
NUMAR Corporation, (ii) NUMAR's subsidiaries and (iii) the wireline logging,
measurement-while-drilling and logging-while-drilling activities (including
research and development) of Halliburton and its affiliates.

     5.2  (A)  Employee acknowledges and agrees that the covenants contained in
Articles 4 and 5 hereof are fair and reasonable in light of the consideration
paid hereunder, and that damages alone shall not be an adequate remedy for any
breach by Employee of his covenants contained herein and accordingly expressly
agrees that:  in addition to any other remedies which Employer may have,
Employer, on its own behalf and on behalf of any of its affiliates, shall be
entitled to injunctive relief in any court of competent jurisdiction for any
breach or threatened breach of any such covenants by Employee.  Nothing
contained herein shall prevent or delay Employer from seeking, in any court of
competent jurisdiction, specific performance or other equitable remedies in the
event of any breach or intended breach by Employee of any of its obligations
hereunder.

          (B)  Notwithstanding the equitable relief available to Employer, the
Employee, in the event of a breach of his covenants contained in Articles 4 and
5 hereof, understands and agrees that the uncertainties and delay inherent in
the legal process would result in the continuing breach for some period of time,
and therefore, continuing injury to Employer until and unless Employer can
obtain such equitable relief.  Therefore, in addition to such equitable relief,
Employer shall be entitled to monetary damages for any such period of breach
until the termination of such breach, in an amount deemed reasonable to cover
all actual and consequential losses, plus all monies received by Employee as a
result of said breach and all costs and attorneys' fees incurred by Employer in
enforcing this Agreement.  If Employee should use or reveal to any other person
or entity any confidential information, this will be considered a continuing
violation on a daily basis for so long a period of time as such confidential
information is made use of by Employee or any such other person or entity.

     5.3. It is expressly understood and agreed that Employer and Employee
consider the restrictions contained in this Article 5 to be reasonable and
necessary to protect the proprietary information and/or goodwill of Employer.
Nevertheless, if any of the aforesaid 

                                       8

 
restrictions are found by a court having jurisdiction to be unreasonable or
overly broad as to geographic area or time, or otherwise unenforceable, the
parties intend for the restrictions herein set forth to be modified by such
courts so as to be reasonable and enforceable and, as so modified to be fully
enforced.

ARTICLE 6: MISCELLANEOUS:

     6.1. For purposes of this Agreement, (i) the terms 'affiliates' or
'affiliated' means an entity who directly, or indirectly through one or more
intermediaries, controls, is controlled by, or is under common control with
Employer, Halliburton or Employee, as the case may be, or in which Employer,
Halliburton or Employee, as the case may be, has a 50% or more equity interest,
and (ii) any action or omission permitted to be taken or omitted by Employer or
Halliburton hereunder shall only be taken or omitted by Employer or Halliburton,
as the case may be, upon the express authority of the Board of Directors of
Employer and/or Halliburton, as applicable, or of any Committee of the
respective Boards to which authority over such matters may have been delegated.

     6.2. Although executed and delivered by the parties hereto, this Agreement
is contingent upon the Employer becoming a subsidiary of Halliburton and shall
not become effective until such time as the Employer has become a subsidiary of
Halliburton.

     6.3. For purposes of this Agreement, notices and all other communications
provided for herein shall be in writing and shall be deemed to have been duly
given when received by or tendered to Employee, Halliburton or Employer, as
applicable, by pre-paid courier or by United States registered or certified
mail, return receipt requested, postage prepaid, addressed as follows:

     If to Employer or Halliburton, to Halliburton Company at its corporate
     headquarters to the attention of the General Counsel of Halliburton
     Company.

     If to Employee, to his last known personal residence.

     6.4. This Agreement shall be governed in all respects by the laws of the
Commonwealth of Pennsylvania, without regard to principles of conflict of law,
unless preempted by federal law, in which case federal law shall govern.

     6.5. No failure by either party hereto at any time to give notice of any
breach by the other party of, or to require compliance with, any condition or
provision of this Agreement shall be deemed a waiver of similar or dissimilar
provisions or conditions at the same or at any prior or subsequent time.

     6.6. It is a desire and intent of the parties that the terms, provisions,
covenants, and remedies contained in this Agreement shall be enforceable to the
fullest extent permitted 

                                       9

 
by law. If any such term, provision, covenant, or remedy of this Agreement or
the application thereof to any person, association, or entity or circumstances
shall, to any extent, be construed to be invalid or unenforceable in whole or in
part, then such term, provision, covenant, or remedy shall be construed in a
manner so as to permit its enforceability under the applicable law to the
fullest extent permitted by law. In any case, the remaining provisions of this
Agreement or the application thereof to any person, association, or entity or
circumstances other than those to which they have been held invalid or
unenforceable, shall remain in full force and effect.

     6.7. This Agreement shall be binding upon and inure to the benefit of
Employer and, to the extent herein provided, Halliburton and any other person,
association, or entity which may hereafter acquire or succeed to all or
substantially all of the business or assets of Employer by any means whether
direct or indirect, by purchase, merger, consolidation, or otherwise. Employee's
rights and obligations under this Agreement are personal and such rights,
benefits, and obligations of Employee shall not be voluntarily or involuntarily
assigned, alienated, or transferred, whether by operation of law or otherwise,
without the prior written consent of Employer, other than in the case of death
or incompetence of Employee.

     6.8. Effective with the effective date that Employer becomes a subsidiary
of Halliburton, this Agreement shall supersede, replace and merge any previous
actions by Employer's Board of Directors or any Committee of such Board,
agreements and discussions pertaining to the subject matter covered herein,
including, without limitation, (i) the reference contained in the minutes of the
January 16, 1997 meeting of the Compensation Committee of Employer's Board of
Directors relating to such Committee's approval of a proposal concerning
severance benefits for Employee upon a change in control of Employer and (ii)
that certain letter agreement between Employer and Employee dated March 10,
1997.  From and after the Effective Date, this Agreement constitutes the entire
agreement of the parties with regard to such subject matter, and contains all of
the covenants, promises, representations, warranties, and agreements between the
parties with respect such subject matter.  Each party to this Agreement
acknowledges that no representation, inducement, promise, or agreement, oral or
written, has been made by either party with respect to such subject matter,
which is not embodied herein, and that no agreement, statement, or promise
relating to the employment of Employee by Employer that is not contained in this
Agreement shall be valid or binding. Any modification of this Agreement will be
effective only if it is in writing and signed by each party whose rights
hereunder are affected thereby, provided that any such modification must be
authorized or approved by the Board of Directors of Employer.


                  REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                       10

 
     IN WITNESS WHEREOF, Employer, Halliburton and Employee have duly executed
this Agreement in multiple originals to be effective on the Effective Date.

                              NUMAR CORPORATION                               
                                                                              
                                                                              
                              By: /s/ DR. MELVIN N. MILLER
                                 -----------------------------------------------
                              Name:   Dr. Melvin N. Miller
                              Title:  Chairman of the Board, President and
                                      Chief Executive Officer
                                                                          
                                                                          
                                                                          
                              HALLIBURTON COMPANY                         
                                                                          
                                                                          
                              By: /s/ LESTER L. COLEMAN
                                 -----------------------------------------------
                              Name:   Lester L. Coleman
                              Title:  Executive Vice President and 
                                      General Counsel
                                                                          
                                                                          
                              EMPLOYEE                               
                                                                          
                                    /s/ EDWARD P. DELSON
                              --------------------------------------------------
                                        Edward P. Delson                       


Date:  6/9/97

                                       11

 
                                 EXHIBIT A TO
                         EXECUTIVE EMPLOYMENT AGREEMENT
                                 BY AND BETWEEN
                      EDWARD P. DELSON, NUMAR CORPORATION
                            AND HALLIBURTON COMPANY



                      NONSTATUTORY STOCK OPTION AGREEMENT

     AGREEMENT made as of the __ day of __________, 1997 between HALLIBURTON
COMPANY, a Delaware corporation (the 'Company'), and Edward P. Delson
('Employee').

     To carry out the purposes of the HALLIBURTON COMPANY 1993 STOCK AND LONG-
TERM INCENTIVE PLAN (the 'Plan'), by affording Employee the opportunity to
purchase shares of common stock, par value $2.50 per share, of the Company
('Stock'), and in consideration of the mutual agreements and other matters set
forth herein, in the Executive Employment Agreement by and between NUMAR
Corporation, the Company and Employee and in the Plan, the Company and Employee
hereby agree as follows:

     1.  GRANT OF OPTION.  The Company hereby irrevocably grants to Employee the
         ---------------                                                        
right and option ('Option') to purchase all or any part of an aggregate of 7,500
shares of Stock, on the terms and conditions set forth herein and in the Plan,
which Plan is incorporated herein by reference as a part of this Agreement. This
Option shall not be treated as an incentive stock option within the meaning of
section 422(b) of the Internal Revenue Code of 1986, as amended (the 'Code').

     2.  PURCHASE PRICE.  The purchase price of Stock purchased pursuant to the
         --------------                                                        
exercise of this Option shall be $________ per share, which has been determined
to be not less than the fair market value of the Stock at the date of grant of
this Option. For all purposes of this Agreement, fair market value of Stock
shall be determined in accordance with the provisions of the Plan.

     3.  EXERCISE OF OPTION.  Subject to the earlier expiration of this Option
         ------------------                                                   
as herein provided, this Option may be exercised, by written notice to the
Company at its principal executive office addressed to the attention of its Vice
President and Secretary, at any time and from time to time after the date of
grant hereof, but, except as otherwise provided below, this Option shall not be
exercisable for more than a percentage of the aggregate number of shares offered
by this Option determined by the number of full years from the date of grant
hereof to the date of such exercise, in accordance with the following schedule:

                                       1

 
 
 
                               Percentage of Shares
     Number of Full Years      That May be Purchased
     --------------------      ---------------------
                               
     Less than 1 year                      0%
     1 year                           33 1/3%
     2 years                              67%
     3 years                             100%
 
     
     This Option is not transferable by Employee otherwise than by will or the
laws of descent and distribution, and may be exercised only by Employee during
Employee's lifetime. This Option may be exercised only while Employee remains an
employee of the Company, subject to the following exceptions:

       (a) If Employee's employment with the Company terminates by reason of
     disability (disability being defined as being physically or mentally
     incapable of performing the Employee's usual duties as an Employee with
     such condition likely to remain continuously and permanently, as determined
     by the Company or employing subsidiary), this Option may be exercised in
     full by Employee (or Employee's estate or the person who acquires this
     Option by will or the laws of descent and distribution or otherwise by
     reason of the death of Employee) at any time during the period of one year
     following such termination.

       (b) If Employee dies while in the employ of the Company, Employee's
     estate, or the person who acquires this Option by will or the laws of
     descent and distribution or otherwise by reason of the death of Employee,
     may exercise this Option in full at any time during the period of one year
     following such termination.

       (c) If Employee's employment with the Company terminates by reason of
     retirement at or after age 65 or early retirement with consent of the
     Committee administering the Plan or its delegate, as appropriate, this
     Option may be exercised by Employee at any time during the period ending on
     the Expiration Date (as defined below), but only as to the number of shares
     Employee was entitled to purchase on the date of such exercise in
     accordance with the schedule set forth above.  If Employee dies after such
     retirement, this Option may be exercised in full by Employee's estate (or
     the person who acquires this Option by will or the laws of descent and
     distribution or otherwise by reason of the death of Employee) during the
     period ending on the earlier of the Expiration Date or the third
     anniversary of Employee's death.

       (d) If Employee shall, as a result of the termination of his employment
     with Employer, become entitled to the severance benefits set forth in
     Section 3.3 of that certain Executive Employment Agreement of even date
     herewith by and among Employee, NUMAR Corporation and the Company (the
     'Employment Agreement'), this Option may be exercised in full by Employee
     at any time during
                                       2

 
     the period of 90 days following such termination or by Employee's estate
     (or the person who acquires this Option by will or the laws of descent and
     distribution or otherwise by reason of the death of the Employee) during
     the period of six months following Employee's death if Employee dies during
     such period. Capitalized terms used in this subparagraph (d) but not
     defined shall have the meanings ascribed in the Employment Agreement. If
     Employee shall become entitled to severance benefits as aforesaid within
     six months from the date of grant of this Option, the time periods
     specified in this subparagraph in which the Option may be exercised shall
     begin at the end of such six month period.

          (e) If Employee's employment with the Company terminates for any
     reason other than those set forth in subparagraphs (a) through (d) above,
     this Option may be exercised by Employee at any time during the period of
     30 days following such termination, or by Employee's estate (or the person
     who acquires this Option by will or the laws of descent and distribution or
     otherwise by reason of the death of the Employee) during a period of six
     months following Employee's death if Employee dies during such 30-day
     period, but in each case only as to the number of shares Employee was
     entitled to purchase hereunder upon exercise of this Option as of the date
     Employee's employment so terminates.

     This Option shall not be exercisable in any event prior to the expiration
of six months from the date of grant hereof or after the expiration of ten years
from the date of grant hereof (the 'Expiration Date') notwithstanding anything
hereinabove contained. The purchase price of shares as to which this Option is
exercised shall be paid in full at the time of exercise (a) in cash (including
check, bank draft or money order payable to the order of the Company), (b) by
delivering to the Company shares of Stock having a fair market value equal to
the purchase price, or (c) by a combination of cash or Stock. Payment may also
be made, in the discretion of the Committee or its delegate, as appropriate, by
delivery (including by facsimile transmission) to the Company of an executed
irrevocable option exercise form, coupled with irrevocable instructions to a
broker-dealer designated by the Company to simultaneously sell a sufficient
number of the shares as to which the option is exercised and deliver directly to
the Company that portion of the sales proceeds representing the exercise price.
No fraction of a share of Stock shall be issued by the Company upon exercise of
an Option or accepted by the Company in payment of the purchase price thereof;
rather, Employee shall provide a cash payment for such amount as is necessary to
affect the issuance and acceptance of only whole shares of Stock. Unless and
until a certificate or certificates representing such shares shall have been
issued by the Company to Employee, Employee (or the person permitted to exercise
this Option in the event of Employee's death) shall not be or have any of the
rights or privileges of a shareholder of the Company with respect to shares
acquirable upon an exercise of this Option.

     4.   WITHHOLDING OF TAX.  To the extent that the exercise of this Option or
          ------------------                                                    
the disposition of shares of Stock acquired by exercise of this Option results
in compensation income to Employee for federal or state income tax purposes,
Employee shall deliver to the Company at the time of such exercise or
disposition such amount of money or shares of

                                       3

 
Stock as the Company may require to meet its withholding obligation under
applicable tax laws or regulations, and, if Employee fails to do so, the Company
is authorized to withhold from any cash or Stock remuneration then or thereafter
payable to Employee any tax required to be withheld by reason of such resulting
compensation income. Employee shall have the right to determine whether money or
shares of Stock shall be delivered to the Company. Upon an exercise of this
Option, the Company is further authorized in its discretion to satisfy any such
withholding requirement out of any cash or shares of Stock distributable to
Employee upon such exercise.

     5.   STATUS OF STOCK.  Notwithstanding any other provision of this
          ---------------                                              
Agreement, in the absence of an effective registration statement for issuance
under the Securities Act of 1933, as amended (the 'Act'), of the shares of Stock
acquirable upon exercise of this Option, or an available exemption from
registration under the Act, issuance of shares of Stock acquirable upon exercise
of this Option will be delayed until registration of such shares is effective or
an exemption from registration under the Act is available. The Company intends
to use its best efforts to ensure that no such delay will occur in the event
exemption from registration under the Act is available upon an exercise of this
Option, Employee (or the person permitted to exercise this Option in the event
of Employee's death or incapacity), if requested by the Company to do so, will
execute and deliver to the Company in writing an agreement containing such
provisions as the Company may require to assure compliance with applicable
securities laws.

     Employee agrees that the shares of Stock which Employee may acquire by
exercising this Option will not be sold or otherwise disposed of in any manner
which would constitute a violation of any applicable securities laws, whether
federal or state.  Employee also agrees (i) that the certificates representing
the shares of Stock purchased under this Option may bear such legend or legends
as the Company deems appropriate in order to assure compliance with applicable
securities laws, (ii) that the Company may refuse to register the transfer of
the shares of Stock purchased under this Option on the stock transfer records of
the Company if such proposed transfer would in the opinion of counsel
satisfactory to the Company constitute a violation of any applicable securities
law and (iii) that the Company may give related instructions to its transfer
agent, if any, to stop registration of the transfer of the shares of Stock
purchased under this Option.

     If Employee desires to sell any shares of Stock acquired pursuant to the
provisions of this Agreement and if such shares may not be sold on the open
market without registration pursuant to applicable securities laws, then the
Company shall, within five days after notice from Employee indicating his
intention to sell such shares and the number of shares to be sold, purchase for
cash such shares at a price per share based on the closing sales price for
shares of Stock traded on the New York Stock Exchange on the date of receipt by
the Company of said notice.

     6.   EMPLOYMENT RELATIONSHIP.  For purposes of this Agreement, Employee
          -----------------------                                           
shall be considered to be in the employment of the Company as long as Employee
remains an employee of either the Company, a parent or subsidiary corporation
(as defined in section 424 of the Code) of the Company, or a corporation or a
parent or subsidiary of such

                                       4

 
corporation assuming or substituting a new option for this Option. Any question
as to whether and when there has been a termination of such employment, and the
cause of such termination, shall be determined by the Committee or its delegate,
as appropriate, and such determination shall be final.

     7.   BINDING EFFECT.  This Agreement shall be binding upon and inure to the
          --------------                                                        
benefit of any successors to the Company and all persons lawfully claiming under
Employee.

     8.   GOVERNING LAW.  This Agreement shall be governed by, and construed in
          -------------                                                        
accordance with, the laws of the State of Texas excluding any conflict-of-law
rule or principle that might refer to the laws of another State or country.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed by its officer thereunto duly authorized, and Employee has executed
this Agreement, all as of the day and year first above written.

                                       HALLIBURTON COMPANY

                                       By:
                                       Name: ____________________________
                                       Title: ___________________________



                                       __________________________________
                                              Edward P. Delson
                                              Employee



                                       5

 
                                 EXHIBIT B TO
                        EXECUTIVE EMPLOYMENT AGREEMENT
                       BY AND BETWEEN EDWARD P. DELSON,
                   NUMAR CORPORATION AND HALLIBURTON COMPANY



                          RESTRICTED STOCK AGREEMENT


     AGREEMENT made as of the ___ day of _________, 1997, between
HALLIBURTON COMPANY, a Delaware corporation (the 'Company'), and Edward P.
Delson ('Employee').

     1.   AWARD.
          ----- 

          (a) SHARES.  Pursuant to the Halliburton Company 1993 Stock and Long-
              ------                                                          
Term Incentive Plan (the 'Plan'), and the Executive Employment Agreement by and
between NUMAR Corporation, the Company and Employee, 3,000 shares (the
'Restricted Shares') of the Company's common stock, par value $2.50 per share
('Stock'), shall be issued as hereinafter provided in Employee's name subject to
certain restrictions thereon.

          (b) ISSUANCE OF RESTRICTED SHARES.  The Restricted Shares shall be
              -----------------------------                                 
issued upon acceptance hereof by Employee and upon satisfaction of the
conditions of this Agreement.

          (c) PLAN INCORPORATED.  Employee acknowledges receipt of a copy of the
              -----------------                                                 
Plan, and agrees that this award of Restricted Shares shall be subject to all of
the terms and conditions set forth in the Plan, including future amendments
thereto, if any, pursuant to the terms thereof, which Plan is incorporated
herein by reference as a part of this Agreement.

     2.   RESTRICTED SHARES.  Employee hereby accepts the Restricted Shares when
          -----------------                          
issued and agrees with respect thereto as follows:

          (a) FORFEITURE RESTRICTIONS.  The Restricted Shares may not be sold,
              -----------------------                                         
assigned, pledged, exchanged, hypothecated or otherwise transferred, encumbered
or disposed of to the extent then subject to the Forfeiture Restrictions (as
hereinafter defined), and in the event of termination of Employee's employment
with the Company or employing subsidiary for any reason other than (i) normal
retirement on or after age sixty-five, (ii) death or (iii) disability as
determined by the Company or employing subsidiary, or except as 

                                       1

 
otherwise provided in the last sentence of subparagraph (b) of this Paragraph 2,
Employee shall, for no consideration, forfeit to the Company all Restricted
Shares to the extent then subject to the Forfeiture Restrictions. The
prohibition against transfer and the obligation to forfeit and surrender
Restricted Shares to the Company upon termination of employment are herein
referred to as 'Forfeiture Restrictions.' The Forfeiture Restrictions shall be
binding upon and enforceable against any transferee of Restricted Shares.

          (b) LAPSE OF FORFEITURE RESTRICTIONS.  The Forfeiture Restrictions
              --------------------------------                              
shall lapse as to the Restricted Shares in accordance with the following
schedule provided that Employee has been continuously employed by the Company
from the date of this Agreement through the lapse date:

 
 
                                   Percentage of Total
                                   Number of Restricted Shares
                                   as to Which Forfeiture
     Lapse Date                        Restrictions Lapse
     ----------                    --------------------------
                                 
First Anniversary of the
 date of this Agreement                      10%

Second Anniversary of the
 date of this Agreement                      10%

Third Anniversary of the
 date of this Agreement                      10%

Fourth Anniversary of the
 date of this Agreement                      10%

Fifth Anniversary of the
 date of this Agreement                      10%

Sixth Anniversary of the
 date of this Agreement                      10%

Seventh Anniversary of the
 date of this Agreement                      10%

Eighth Anniversary of the
 date of this Agreement                      10%
 

                                       2

 
 
                                           
Ninth Anniversary of the
 date of this Agreement                      10%

Tenth Anniversary of the
 date of this Agreement                      10%
 

Notwithstanding the foregoing, the Forfeiture Restrictions shall lapse as to all
of the Restricted Shares on the earlier of (i) the occurrence of a Corporate
Change (as such term is defined in the Plan), (ii) the date Employee's
employment with the Company is terminated by reason of death, disability (as
determined by the Company or employing subsidiary) or normal retirement on or
after age sixty-five or (iii) the date on which Employee shall become entitled
to the severance benefits set forth in Section 3.3 of that certain Executive
Employment Agreement of even date herewith by and among Employee, NUMAR
Corporation and the Company.  In the event Employee's employment is terminated
for any other reason, including retirement prior to age sixty-five with the
approval of the Company or employing subsidiary, the Committee which administers
the Plan (the 'Committee') or its delegate, as appropriate, may, in the
Committee's or such delegate's sole discretion, approve the lapse of Forfeiture
Restrictions as to any or all Restricted Shares still subject to such
restrictions, such lapse to be effective on the date of such approval or
Employee's termination date, if later.

          (c) CERTIFICATES.  A certificate evidencing the Restricted Shares
              ------------                                                 
shall be issued by the Company in Employee's name, or at the option of the
Company, in the name of a nominee of the Company, pursuant to which Employee
shall have voting rights and shall be entitled to receive all dividends unless
and until the Restricted Shares are forfeited pursuant to the provisions of this
Agreement.  The certificate shall bear a legend evidencing the nature of the
Restricted Shares, and the Company may cause the certificate to be delivered
upon issuance to the Secretary of the Company or to such other depository as may
be designated by the Company as a depository for safekeeping until the
forfeiture occurs or the Forfeiture Restrictions lapse pursuant to the terms of
the Plan and this award.  Upon request of the Committee or its delegate,
Employee shall deliver to the Company a stock power, endorsed in blank, relating
to the Restricted Shares then subject to the Forfeiture Restrictions.  Upon the
lapse of the Forfeiture Restrictions without forfeiture, the Company shall cause
a new certificate or certificates to be issued without legend in the name of
Employee for the shares upon which Forfeiture Restrictions lapsed.
Notwithstanding any other provisions of this Agreement, the issuance or delivery
of any shares of Stock (whether subject to restrictions or unrestricted) may be
postponed for such period as may be required to comply with applicable
requirements of any national securities exchange or any requirements under any
law or regulation applicable to the issuance or delivery of such shares.  The
Company shall not be obligated to issue or deliver any shares of Stock if the

                                       3

 
issuance or delivery thereof shall constitute a violation of any provision of
any law or of any regulation of any governmental authority or any national
securities exchange.

     3.   WITHHOLDING OF TAX.  To the extent that the receipt of the Restricted
          ------------------                         
Shares or the lapse of any Forfeiture Restrictions results in income to Employee
for federal or state income tax purposes, Employee shall deliver to the Company
at the time of such receipt or lapse, as the case may be, such amount of money
or shares of unrestricted Stock as the Company may require to meet its
withholding obligation under applicable tax laws or regulations, and, if
Employee fails to do so, the Company is authorized to withhold from any cash or
Stock remuneration then or thereafter payable to Employee any tax required to be
withheld by reason of such resulting compensation income.

     4.   STATUS OF STOCK.  Employee agrees that the Restricted Shares will not
          ---------------                           
be sold or otherwise disposed of in any manner which would constitute a
violation of any applicable federal or state securities laws. Employee also
agrees (i) that the certificates representing the Restricted Shares may bear
such legend or legends as the Company deems appropriate in order to assure
compliance with applicable securities laws, (ii) that the Company may refuse to
register the transfer of the Restricted Shares on the stock transfer records of
the Company if such proposed transfer would be in the opinion of counsel
satisfactory to the Company constitute a violation of any applicable securities
law and (iii) that the Company may give related instructions to its transfer
agent, if any, to stop registration of the transfer of the Restricted Shares.

     5.   EMPLOYMENT RELATIONSHIP.  For purposes of this Agreement, Employee
          -----------------------                  
shall be considered to be in the employment of the Company as long as Employee
remains an employee of either the Company, any successor corporation or a parent
or subsidiary corporation (as defined in section 424 of the Code) of the Company
or any successor corporation. Any question as to whether and when there has been
a termination of such employment, and the cause of such termination, shall be
determined by the Committee, or its delegate, as appropriate, and its
determination shall be final.

     6.   COMMITTEE'S POWERS.  No provision contained in this Agreement shall in
          ------------------                         
any way terminate, modify or alter, or be construed or interpreted as
terminating, modifying or altering any of the powers, rights or authority vested
in the Committee or, to the extent delegated, in its delegate pursuant to the
terms of the Plan or resolutions adopted in furtherance of the Plan, including,
without limitation, the right to make certain determinations and elections with
respect to the Restricted Shares.

     7.   BINDING EFFECT.  This Agreement shall be binding upon and inure to the
          --------------                          
benefit of any successors to the Company and all persons lawfully claiming under
Employee.

                                       4

 
     8.   GOVERNING LAW.  This Agreement shall be governed by, and construed in
          -------------                          
accordance with, the laws of the State of Texas.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed by an officer thereunto duly authorized, and Employee has executed this
Agreement, all as of the date first above written.


                                    HALLIBURTON COMPANY



                                    By:____________________________
                                    Name:_____________________
                                    Title:____________________



                                    _______________________________
                                           Edward P. Delson
                                           Employee

                                       5

 
Please Check Appropriate Item (One of the boxes must be checked):

     [_]  I DO NOT desire the alternative tax treatment provided for
          in the Internal Revenue Code Section 83(b).

     [_]* I DO desire the alternative tax treatment provided for in
          Internal Revenue Code Section 83(b) and desire that forms
               for such purpose be forwarded to me.
 


*    I ACKNOWLEDGE THAT THE COMPANY HAS SUGGESTED THAT BEFORE THIS BLOCK IS
     CHECKED THAT I CHECK WITH A TAX CONSULTANT OF MY CHOICE.



Please furnish the following information for shareholder records:


____________________________________         ______________________
(Given name and initial must be used         Social Security Number
for stock registry)                          (if applicable)

____________________________________         ______________________
                                             Birth Date
                                             Month/Day/Year

____________________________________         ______________________
                                             Name of Employer

____________________________________         ______________________
Address (Zip Code)                           Day phone number

United States Citizen:  Yes___ No___

             PROMPTLY NOTIFY THIS OFFICE OF ANY CHANGE IN ADDRESS.

                                       6


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