Document:

EXHIBIT 10.25

             NGSG                               Natural Gas Services Group, Inc.
NATURAL GAS SERVICES GROUP, INC.                        2911 S. County Road 1260
                                                            Midland, Texas 79706
                                                                  (915) 563-3974
                                                              Fax (915) 563-4139

                               EMPLOYMENT CONTRACT

     THIS EMPLOYMENT  CONTRACT  ("Agreement") is made and entered into as of the
13th day of October,  2003, by and between Natural Gas Services  Group,  Inc., a
Texas Corporation, whose address is 2911 South County Road 1260, Midland, Texas,
79706, hereinafter referred to in this Agreement as the "EMPLOYER", and W. Randy
Larkin,  whose address is 5609 Heartland,  Midland,  Texas,  79707,  hereinafter
referred to in this Agreement as "the Employee."

                                    ARTICLE I

                               TERM OF EMPLOYMENT

     1.01.  The  Employer  employs  the  Employee,   and  the  Employee  accepts
employment  with the  Employer,  for the Eighteen  Month period from October 13,
2003 through April 13, 2005,  and  thereafter  until  terminated by either party
upon thirty (30) days advance written notice to the other party (herein referred
to as the "term of  employment")  or as defined by an extended or new employment
contract as agreed to by Employer and Employee  upon  completion  of the initial
term of Employment. However, the term of employment may be terminated earlier as
provided in Article 5.

                                    ARTICLE 2

                               DUTIES OF EMPLOYEE

                                  Basic Duties

     2.01.  The Employee is hired as the Director of Sales and  Marketing of the
Employer. The Employee shall perform all services, acts, or things necessary and
advisable  to manage and conduct the  business of the  Employer,  subject to the
policies set by the board of directors from time-to-time.

     The Employee agrees to devote  substantially  all of his entire  productive
time,  ability and attention to the business of the Employer  during the term of
employment.  The services of the Employee  shall be performed at such  locations
and at such  times as  shall  be  directed  by the CEO  from  time-to-time.  The
Employee  shall to the best of his ability  make every  effort to  promote.  the
business of the Employer.

            Employer to Provide Transportation and Ordinary Expenses

     2.02.  The  Employer  agrees to provide a properly  registered  vehicle for
transportation  required for the performance of the Employee's duties under this
Agreement.  Employer  shall provide all  insurance,  fuel,  repairs and Employee
shall use every reasonable effort to properly maintain said vehicle.

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                                    ARTICLE 3

                            COMPENSATION OF EMPLOYEE

                          Bask Salary and Sign on Bonus

     3.01. The Employee shall receive a salary as established from  time-to-time
by the  Directors,  but in no event shall the annual  salary be less than Ninety
Thousand  Dollars  ($90,000.00),  paid  biweekly.  If the  Employee  voluntarily
terminates  employment  prior to October 13, 2005 or is  terminated  pursuant to
Article 5 prior to April 13, 2005, or if the Employee's employment is terminated
by either party at any time after December 31, 2003, the Employee's  salary will
be paid  only to the date of  termination  of  employment.  A total  payment  of
$11,400.00  shall be paid by  Employer to be paid in full to Employee on January
1, 2004.  Employee shall reimburse Employer if Contract is willfully  terminated
by Employee prior to completion of the initial term of Employment.

                              Executive Bonus Pool

     3.02. The Employee shall receive an annual  Executive bonus during the term
of employment,  starting January 1, 2004, not eligible for 2003 Executive Bonus,
determined  by the  Employers  Board of Directors  based on Goals met during the
calendar  year.  Goals for Employer and  percentage  of Pool to each Employee in
Pool shall be determined by the  Compensation  Committee_  Such Executive  bonus
shall be determined for each annual period commencing as of January 1 and ending
as of December 31 (the "Contract Year"), with payment to the Employee to be made
on an annual basis during the next calendar year.

                              Vacation and Sick Pay

     3.03.  After the  completion  of six (6) months of service in the employ of
the Employer,  the Employee shall be entitled to an annual paid vacation of five
(5) business days with full pay,  after one (1) year of service  employee  shall
receive ten (10) days, and after two (2) years of service employee shall receive
fifteen  (15)  days  with full  pay.  Such  vacation  shall be taken at any time
selected by the Employee and approved by the Employer. In addition, the Employee
shall be entitled to three (3) days per year as sick leave with pay. Up to three
(3) days of sick leave may be  accumulated  and up to ten (10) days of  vacation
may be  accumulated  in addition to those days Employee is entitled to under the
then existing pay year. All other  accumulated but unused time will be waived by
the Employee.

     3.04.  The  Employee  shall be entitled  to a holiday  with full pay on New
Year's  Day,  Memorial  Day,  independence  Day,  Labor Day,  Thanksgiving  Day,
Christmas Day, and/or any other day designated as a holiday by the Employer.

                                 Other Benefits

     3.05.  All  base  compensation  provided  for in this  Agreement  shall  be
exclusive  of any  benefits  which the board of  directors  of the  Employer may
elect,  in its sole and  complete  discretion,  after  the date  hereof  to make
available to the Employee under any bonus plan,  profit  sharing trust,  pension
plan,  deferred  compensation  plan,  hospitalization  plan,  medical  or dental
services plans,  health  insurance plan, or any other employee benefit plan that
may be in effect at any time or from time-to-time  during the term of employment
hereof.  The Employer  agrees that during the term of  employment  the Employees
shall be  afforded  the  opportunity  to  participate  in any such plan which is
generally available to other employees of the Employer other than any bonus plan
or  other  plan  measured  by  the  income  or   performance  of  the  Employer.
Participating  in any such plans shall be consistent with the Employee's rate of
basic compensation to the extent that compensation is a determinant with respect
to coverage or participation under any such plan;  provided,  however,  that the
Employee's  participation  shall  not be  limited  by  reason of income or basic
compensation  if such  limitations are not necessary to obtain tax deductions or
are not required by law.

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                                    ARTICLE 4

                         PROPERTY RIGHTS OF THE PARTIES

                             Inventions and Patents

     4.01. The Employee  agrees that he will promptly and completely  inform and
disclose to the Employer all inventions,  designs,  improvements and discoveries
that the Employee may have during the term of employment  that pertain or relate
to the  business of the Employer or to any  experimental  work carried on by the
Employer,  whether conceived by the Employee alone or with others and whether or
not conceived  during  regular  working  hours.  All such  inventions,  designs,
improvements  and discoveries  shall be the exclusive  property of the Employer.
The  Employee  shall  assist  the  Employer  in  obtaining  patents  on all such
inventions,  designs,  improvements  and  discoveries  deemed  patentable by the
Employer.

                            Trade Secrets of Employer

     4.02. During the term of employment under this Agreement, the Employee will
have access to and become  familiar with various trade secrets.  The term "trade
secrets"  means  devices,  secret  inventions,  processes  and  compilations  of
information,  records and  specifications,  which are owned by the  Employer and
that, are regularly  used in the operation of the business of the Employer.  The
Employee  shall not disclose any trade secrets of the Employer  during or at any
time after the term of this  Agreement,  except as required in the course of his
employment  under this  Agreement.  All  files,  records,  documents,  drawings,
specifications,  equipment  and similar  items  relating to the  business of the
Employer,  whether or not prepared by the  Employee,  shall remain the exclusive
property of the Employer and shall not be removed under any  circumstances  from
the premises  where the work of the Employer is being  carried on,  unless prior
written consent of the Employer has been obtained.

                   Confidential Data of Customers of Employer

     4.03. In the course of performing duties under this Agreement, the Employee
will be handling financial,  accounting,  statistical and personnel  information
concerning  employees  and customers of the Employer.  All such  information  is
confidential and shall not be disclosed,  directly or indirectly,  to any person
other than agents of the Employer,  either during the term of this  Agreement or
any time before a two (2) Year period after employment termination.

                                    ARTICLE 5

                            TERMINATION OF EMPLOYMENT

                        Termination by Employer for Cause

     5.01.  The Employer may at its option  terminate this Agreement at any time
by giving written notice of termination to the Employee without prejudice to any
other remedy to which the Employer may be entitled either at law, in equity,  or
under this Agreement, if the Employee:

     (a)  Willfully breaches or habitually neglects the duties that the Employee
          is required to perform under the terms of this Agreement;

     (b)  Willfully violates reasonable and substantial rules governing employee
          performance;

     (c)  Refuses  to  obey  reasonable  orders  in a  manner  that  amounts  to
          insubordination;

     (d)  Commits clearly dishonest acts toward the Employer; or

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     (e)  Engages in acts of disruption or violence such as unprovoked fighting.

The Employee will be given a Severance Package based on three (3) Months of Base
Salary and forfeiting any other compensation including the Executive Bonus Pool.

                   Termination on Grounds Other Than for Cause

     5.02. This Agreement  shall terminate  immediately on the occurrence of any
one of the following events:

     (a)  The occurrence of circumstances (ie: sold, bankrupt,  out of business,
          etc.) that make it impossible or impracticable for the business of the
          Employer to be continued;

     (b)  The death of the Employee;

     (c)  The loss by the Employee of legal capacity; or

     (d)  The  continued  incapacity  on the part of the Employee to perform his
          duties for a continuous  period of thirty (30) days,  unless waived by
          the Employer.

A Severance Package of three (3) months Salary shall be in effect for any of the
above reasons of (5.02) except (5.02a) during the initial  Contract Period which
the Severance Package shall be Eighteen (18) Months Salary.

                                    ARTICLE 6

              EMPLOYEE'S OBLIGATIONS OTHER THAN TO PERFORM SERVICES

                                 Indemnification

     6.01.  The Employee  shall  indemnify and hold  harmless  Employer from all
liability from loss, damage, or injury to persons or property resulting from the
willful  misconduct  of the Employee  committed  in the scope of the  EmpIoyee's
employment.

                                    ARTICLE 8

                               GENERAL PROVISIONS

                                     Notices

     7.01. Any notices required to be given under this Agreement by either party
to the other may be effected either by personal  delivery in writing or by mail,
registered and certified,  postage prepaid with return receipt requested. Mailed
notices  shall be  addressed  to the parties at the  addresses  appearing in the
introductory  paragraph  of this  Agreement.  Each party may change that party's
address by written notice in accordance  with the Paragraph.  Notices  delivered
personally shall be deemed effective as of actual receipt.  Mailed notices shall
be deemed effective as of two (2) days after posting with the United States Mail
Service.

                              Entirety of Agreement

     8.02.  This  Agreement  supersedes  all  previous  agreements  between  the
Employee and the  Employer,  and contains the entire  understanding  between the
parties with respect to the subject matter  specified in the in this  Agreement.
Each party to this Agreement acknowledges that no other agreement, statement, or
promise  not  contained  in this  Agreement  shall  be  valid  or  binding.  Any
modification of this Agreement will be effective only if it is in writing signed
by the parties hereto.

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                               Partial Invalidity

     8.03.  If any  provision in this  Agreement is held by a court of competent
jurisdiction to be invalid,  void, or  unenforceable,  the remaining  provisions
shall nevertheless  continue in full force without being impaired or invalidated
in any way.

                             Law Governing Agreement

     8.04.  It is the intent of the parties  that this  Agreement be governed by
and construed in accordance with the laws of the State of Texas.

                                     Waiver

     8.05.  The failure of either the  Employer or the Employee to insist in one
or more  instances  upon  performance  of any of the terms or conditions of this
Agreement shall not be construed as a waiver of future  performance  required by
such term or condition,  and the obligations of either party with respect to the
term or condition shall continue in effect as if no forbearance had occurred. No
covenant or  condition  of this  Agreement  may be waived  except by the written
consent of the waiving party.

                                    Captions

     8.06. The captions contained in this Agreement are for convenient reference
only and do not affect the meaning of any term or provision.

                                 Binding Effect

     8.07.  This  Agreement  shall be binding  upon the parties  hereto and upon
their successors, heirs, executors and assigns.

     EXECUTED in multiple originals as of the date first written above.

EMPLOYER:
--------

NATURAL GAS SERVICES GROUP, INC.

By:  /s/ Wayne L. Vinson
    --------------------
    Wayne L. Vinson
    President/CEO

By:  /s/ W. Randy Larkin
    --------------------
    W. Randy Larkin

                                       5EXHIBIT 10.26

                                 PROMISSORY NOTE

$2,100,000.00                   Midland, Texas                   January 3, 2005

     FOR VALUE RECEIVED,  in the manner,  on the dates and in the amounts herein
stipulated,   Natural  Gas  Services  Group,  Inc.  (the  "Maker"),  a  Colorado
corporation with principal offices at 2911 S. County Road 1260,  Midland,  Texas
79706,  promises to pay to the order of Paul D. Hensley,  an individual residing
at 3005 N. 15th Street, Broken Arrow,  Oklahoma 74012 ("Payee"),  at his address
in the City of Broken  Arrow,  Tulsa  County,  Oklahoma,  in lawful money of the
United States of America, the sum of Two Million One Hundred Thousand and No/100
Dollars  ($2,100,000.00),  together with interest on the  outstanding  principal
balance  hereof  (calculated  on the  basis of  actual  days  elapsed  in a year
consisting of 365 days) from date until maturity at a rate equal to four percent
(4.00%) per annum.

     Principal on this Promissory Note (this "Note") shall be due and payable in
three equal annual installments as follows:

          (1)  $700,000.00  shall  be  due  and  payable  on  January  3,  2006;
     $700,000.00 shall be due and payable on January 3, 2007; and

          (2) one final  installment of all remaining  unpaid principal shall be
     due and payable in full on January 3, 2008.

     Accrued and unpaid  interest on the unpaid  principal  balance of this Note
shall  be due and  payable  on the  same  dates  as,  but in  addition  to,  the
installments of principal.

     Subject to the prior written consent of Payee,  Maker may, but shall not be
obligated to, make principal payments on this Note:

          (1) in shares (only whole  shares) of Buyer Common Stock valued at the
     Cash Equivalent Amount Per Share for the purposes of determining the number
     of shares of Buyer Common Stock to be issued; or

          (2) by combination of cash and such shares.

     "Cash  Equivalent  Amount Per Share" means the average of the daily closing
prices of Buyer  Common  Stock on the  American  Stock  Exchange  for the twenty
consecutive  trading days commencing  thirty trading days before the due date of
any principal payment.

     All past due  principal on this Note shall bear interest at the rate of ten
percent (10%) per annum until such sums have been paid; provided,  however, that

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in no event  shall  interest  on this  Note  ever be  charged  or paid at a rate
greater than the maximum  nonusurious  rate  permitted by applicable  federal or
Texas law from time to time in effect,  whichever shall permit the higher lawful
rate (the "Highest Lawful Rate"). Interest shall be computed on the basis of the
actual number of days elapsed in a year composed of 365 or 366 days, as the case
may be. At all such times,  if any, as Chapter One ("Chapter  One") of the Texas
Credit Code shall  establish the Highest  Lawful Rate,  the Highest  Lawful Rate
shall be the "indicated  rate ceiling" (as defined in Chapter One ) from time to
time in effect.

     If, for any reason  whatever,  the  interest  paid or received on this note
shall  exceed the Highest  Lawful  Rate,  the owner or holder of this note shall
refund to the payor or, at the option of such owner or  holder,  credit  against
the  principal of this note such portion of said  interest as shall be necessary
to cause  the  interest  actually  paid and  retained  on this note to equal the
Highest Lawful Rate. All sums paid or agreed to be paid to the holder or holders
hereof for the use,  forbearance  or  detention  of the  indebtedness  evidenced
hereby shall, to the extent permitted by applicable law, be amortized, prorated,
allocated and spread throughout the full term of this note.

     Maker may prepay this Note in whole or in part at any time and from time to
time without the payment of any premium or fee. All prepayments  hereon shall be
applied to the installments of principal in inverse order of their maturities.

     This Note is one of the Promissory  Notes referred to in the Stock Purchase
Agreement,  dated of even date herewith, by and among Screw Compression Systems,
Inc., a Texas  corporation,  Jim Hazlett,  Tony  Vohjesus,  Payee and Maker (the
"Agreement"),  and is subject  to the terms and  conditions  of such  Agreement.
Reference  is made to the  Agreement  for a statement  of the rights,  remedies,
powers,  privileges,  benefits,  duties and obligations of Maker and Payee under
the Agreement.  Capitalized terms used herein which are defined in the Agreement
shall have such defined meanings unless otherwise defined herein.

     Payment of this Note is secured by that certain  Irrevocable Standby Letter
of Credit, dated January 3, 2005, in the face amount of One Million Four Hundred
Thousand and No/100 Dollars  ($1,400,000.00),  issued by Western  National Bank,
Midland, Texas, naming Payee as beneficiary.  Reference is made to the Letter of
Credit for a statement  of the nature and extent of the  security and the rights
and obligations of the Maker and Payee thereunder.

     Time is of the  essence  of this Note.  If Maker  fails to pay when due any
installment  of principal and such failure to pay continues for a period of five
days after Maker's receipt of written notice from Payee, the holder of this Note
may, at such holder's option, declare the entirety of the indebtedness evidenced
hereby  immediately due and payable and exercise any other  available  remedies,
and failure to exercise  any remedy  shall not  constitute a waiver at any other
time.

     If this  Note or any  installment  or part  hereof  is not paid  when  due,
whether  at  maturity  or by  acceleration,  or if it  is  collected  through  a
bankruptcy, probate or other court proceeding, whether before or after maturity,
the undersigned  agrees to pay all costs and expenses of collection,  including,
but not limited to, reasonable attorneys' fees, incurred by the holder hereof.

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     Maker  waives  notice  (including,  but not limited to,  notice of protest,
notice of dishonor,  notice of intent to accelerate and notice of acceleration),
demand,  presentment for payment,  protest,  diligence in collecting or bringing
suit and the filing of suit for the purpose of fixing liability.

     EXECUTED to be effective as of the date and year first written above.

                                                NATURAL GAS SERVICES GROUP, INC.

                                            By:  /s/ Wallace C. Sparkman
                                                --------------------------------
                                                Wallace C. Sparkman, President

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