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                                                                   EXHIBIT 10.20



                           AMENDMENT NO. 1999-1 TO THE
                             1993 STOCK OPTION PLAN

                  This Amendment No. 1999-1 is made to the Baker Hughes
Incorporated 1993 Stock Option Plan ("the Plan"). Capitalized terms used but not
defined herein shall have the meanings ascribed to them in the Plan.

                  WHEREAS, Baker Hughes Incorporated (the "Company") has
determined that it is in its best interest and that of its stockholders to amend
the Plan as set forth herein;

                  NOW, THEREFORE, the Plan is amended as follows:

                  1. Article I, Paragraphs 11(a), (b) and (f) of the Plan are
amended in their entirety to read as follows:

                           "11.     Change in Control.

                                    (a) Notwithstanding any provision of the
                  Plan to the contrary, in the event of an occurrence of a
                  Change in Control other than an event described only in clause
                  (3) of Paragraph 11(f) of the Plan, all options granted
                  pursuant to this Plan shall become fully vested and
                  exercisable.

                                    (b) Notwithstanding any provision of the
                  Plan to the contrary, all outstanding options held by an
                  Employee Optionee shall become fully vested and exercisable as
                  of the effective date of termination of such Employee
                  Optionee's employment if (i) such Employee Optionee's
                  employment is terminated by the Company without Cause prior to
                  a Change in Control (whether or not a Change in Control ever
                  occurs) and such termination was at the request or direction
                  of a Person who has entered into an agreement with the Company
                  the consummation of which would constitute a Change in
                  Control, (ii) such Employee Optionee terminates his or her
                  employment for Good Reason prior to a Change in Control
                  (whether or not a Change in Control ever occurs) and the
                  circumstance


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                  or event which constitutes Good Reason occurs at the request
                  or direction of the Person described in clause (i), (iii) such
                  Employee Optionee's employment is terminated by the Company
                  without Cause or by the Employee Optionee for Good Reason and
                  such termination or the circumstance or event which
                  constitutes Good Reason is otherwise in connection with or in
                  anticipation of a Change in Control (whether or not a Change
                  in Control ever occurs) or (iv) such Employee Optionee's
                  employment is terminated by the Company without Cause or by
                  the Employee Optionee for Good Reason, in either case within 2
                  years following the occurrence of a Change in Control
                  described in clause (3) of Paragraph 11(f) of the Plan.


                                    (f) A "Change in Control" shall be deemed to
                  have occurred if the event set forth in any one of the
                  following paragraphs shall have occurred:

                                            (1) any Person is or becomes the
                  Beneficial Owner, directly or indirectly, of securities of the
                  Company (not including in the securities beneficially owned by
                  such Person any securities acquired directly from the Company
                  or its affiliates) representing 20% or more of the combined
                  voting power of the Company's then outstanding securities,
                  excluding any Person who becomes such a Beneficial Owner in
                  connection with a transaction described in clause (i) of
                  paragraph (3) below; or

                                            (2) the following individuals cease
                  for any reason to constitute a majority of the number of
                  directors then serving: individuals who, on the date hereof,
                  constitute the Board of Directors of the Company and any new
                  director (other than a director whose initial assumption of
                  office is in connection with an actual or threatened election
                  contest relating to the election of directors of the Company)
                  whose appointment or election by the Board of Directors of the
                  Company or nomination for election by the Company's
                  stockholders was approved 



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                  or recommended by a vote of at least two-thirds (2/3) of the
                  directors then still in office who either were directors on
                  the date hereof or whose appointment, election or nomination
                  for election was previously so approved or recommended; or

                                            (3) there is consummated a merger or
                  consolidation of the Company or any direct or indirect
                  subsidiary of the Company with any other corporation, other
                  than (i) a merger or consolidation which would result in the
                  voting securities of the Company outstanding immediately prior
                  to such merger or consolidation continuing to represent
                  (either by remaining outstanding or by being converted into
                  voting securities of the surviving entity or any parent
                  thereof), in combination with the ownership of any trustee or
                  other fiduciary holding securities under an employee benefit
                  plan of the Company or any subsidiary of the Company, at least
                  65% of the combined voting power of the securities of the
                  Company or such surviving entity or any parent thereof
                  outstanding immediately after such merger or consolidation, or
                  (ii) a merger or consolidation effected to implement a
                  recapitalization of the Company (or similar transaction) in
                  which no Person is or becomes the Beneficial Owner, directly
                  or indirectly, of securities of the Company (not including in
                  the securities Beneficially Owned by such Person any
                  securities acquired directly from the Company or its
                  Affiliates other than in connection with the acquisition by
                  the Company or its Affiliates of a business) representing 20%
                  or more of the combined voting power of the Company's then
                  outstanding securities; or

                                            (4) there is consummated a merger or
                  consolidation of the Company or any direct or indirect
                  subsidiary of the Company with any other corporation, other
                  than a merger or consolidation immediately following which the
                  individuals who comprise the Board immediately prior thereto
                  constitute at least a majority of the board of directors of
                  the Company,


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                  the entity surviving such merger or any parent thereof (or a
                  majority plus one member where such board comprises an odd
                  number of members); or

                                            (5) the stockholders of the Company
                  approve a plan of complete liquidation or dissolution of the
                  Company or there is consummated an agreement for the sale or
                  disposition by the Company of all or substantially all of the
                  Company's assets, other than a sale or disposition by the
                  Company of all or substantially all of the Company's assets to
                  an entity, at least 65% of the combined voting power of the
                  voting securities of which are owned by stockholders of the
                  Company in substantially the same proportions as their
                  ownership of the Company immediately prior to such sale.

                           Notwithstanding the foregoing, a "Change in Control"
                  shall not be deemed to have occurred by virtue of the
                  consummation of any transaction or series of integrated
                  transactions immediately following which the record holders of
                  the common stock of the Company immediately prior to such
                  transaction or series of transactions continue to have
                  substantially the same proportionate ownership in an entity
                  which owns all or substantially all of the assets of the
                  Company immediately following such transaction or series of
                  transactions."


                  2   Article II, Paragraph 3(b)(2)(i) of the Plan is amended by
inserting the phrase "(but in no event later than the Nonqualified Option
Expiration Date)" after the second appearance of the phrase "termination of
employment" therein.

                  3   Article II, Paragraph 3(b)(2)(iv) of the Plan is amended
in its entirety to read as follows:

                           "At the expiration of a period of three months after
                  the Employee Optionee's employment is terminated (but in no
                  event later than the Nonqualified Option Expiration Date) if
                  the 


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                  Employee Optionee's employment is terminated for any reason
                  other than his death, retirement, disability or the reasons
                  specified in this Article II, Paragraph 3(b)(2)(i), if such
                  termination of employment occurs prior to a Change in Control
                  or after the second anniversary of a Change in Control, and
                  two years following such termination of employment (but in no
                  event later than the Nonqualified Option Expiration Date) if
                  such termination is either by the Company without Cause or by
                  the Employee Optionee for Good Reason and, in either case,
                  occurs within two years following a Change in Control (in each
                  case, as such term is defined in Article I, Paragraph 11(f)
                  hereof)."

                  4   Article III, Paragraph 3(b)(2)(i) of the Plan is amended 
by inserting the phrase "(but in no event later than the ISO Expiration Date)"
after the second appearance of the phrase "termination of employment" therein".

                  5   Article III, Paragraph 3(b)(2)(iv) of the Plan is amended
in its entirety to read as follows:

                           "At the expiration of a period of three months after
                  the Employee Optionee's employment is terminated (but in no
                  event later than the ISO Expiration Date) if the Employee
                  Optionee's employment is terminated for any reason other than
                  his death, retirement, disability or the reasons specified in
                  this Article III, Paragraph 3(b)(2)(i), if such termination of
                  employment occurs prior to a Change in Control or after the
                  second anniversary of a Change in Control, and two years
                  following such termination of employment (but in no event
                  later than the ISO Expiration Date) if such termination is
                  either by the Company without Cause or by the Employee
                  Optionee for Good Reason and, in either case, occurs within
                  two years following a Change in Control (in each case, as such
                  term is defined in Article I, Paragraph 11(f) hereof)."

                  6   Article IV, Paragraph 5(b)(2)(i) of the Plan is amended by
inserting the phrase "(but in no event


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later than the Option Expiration Date)" after the second appearance of the
phrase "termination of service" therein.

                  7   Article IV, Paragraph 5(b)(2)(iv) of the Plan is amended 
in its entirety to read as follows:

                           "At the expiration of a period of three months after
                  the Non-Employee Director's directorship is terminated (but in
                  no event later than the Option Expiration Date) if the
                  Non-Employee Director's directorship is terminated for any
                  reason other than the reasons specified in Article IV,
                  Paragraphs 5(b)(2)(i) through 5(b)(2)(iii), if such
                  termination of directorship occurs prior to a Change in
                  Control or after the second anniversary of a Change in
                  Control, and two years following such termination of
                  directorship (but in no event later than the Option Expiration
                  Date) if such termination occurs within two years following a
                  Change in Control (in each case, as such term is defined in
                  Article I, Paragraph 11(f) hereof)."

                  The effective date of this Amendment No. 1999-1 shall be
January 27, 1999; provided, however, that, in the event that (A) the Company is
party to a transaction which is otherwise intended to qualify for "pooling of
interests" accounting treatment, (B) such transaction constitutes a Change in
Control within the meaning of the Plan and (C) individuals who satisfy the
requirements in clauses (i) and (ii) below constitute at least two-thirds (2/3)
of the number of directors of the entity surviving such transaction or any
parent thereof: individuals who (i) immediately prior to such transaction
constitute the Board of Directors of the Company and (ii) on the date hereof
constitute the Board of Directors of the Company and any new director (other
than a director whose initial assumption of office is in connection with an
actual or threatened election contest relating to the election of directors of
the Company) whose appointment or election by the Board of Directors of the
Company or nomination for election by the Company's stockholders was approved or
recommended, by a vote of at least two-thirds (2/3) of the directors then still
in office who either were directors on the date hereof or whose appointment,




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election or nomination for election was previously so approved or recommended
then (a) this Amendment No. 1999-1 shall, to the extent practicable, be
interpreted so as to permit such accounting treatment, and (b) to the extent
that the application of clause (a) of this sentence does not preserve the
availability of such accounting treatment, then, to the extent that any
provision or combination of provisions of this Amendment No. 1999-1 disqualifies
the transaction as a "pooling" transaction (including, if applicable, this
entire Amendment No. 1999-1), the Board of Directors of the Company shall amend
such provision or provisions if and to the extent necessary (including declaring
such provision or provisions to be null and void as of the date hereof) so that
such transaction may be accounted for as a "pooling of interests." All
determinations with respect to this paragraph shall be made by the Company,
based upon the advice of the accounting firm whose opinion with respect to
"pooling of interests" is required as a condition to the consummation of such
transaction. Except as herein modified, the Plan shall remain in full force and
effect.

                                    BAKER HUGHES INCORPORATED



                                    By:
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                                       Name:  G.S. Finley
                                       Title: Senior Vice President
                                              and Chief Administrative Officer





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