Document:

10.2 (1) Form of Common Stock Purchase Warrant

THIS WARRANT AND THE COMMON  SHARES  ISSUABLE UPON EXERCISE OF THIS WARRANT HAVE
NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE
STATE SECURITIES LAWS. THIS WARRANT AND THE COMMON SHARES ISSUABLE UPON EXERCISE
OF THIS WARRANT MAY NOT BE SOLD,  OFFERED FOR SALE,  PLEDGED OR  HYPOTHECATED IN
THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO THIS WARRANT UNDER SAID
ACT AND APPLICABLE  STATE  SECURITIES  LAWS OR AN OPINION OF COUNSEL  REASONABLY
SATISFACTORY TO AUTOCARBON.COM, INC. THAT SUCH REGISTRATION IS NOT REQUIRED.

Right to  Purchase  _________  Shares of Common  Stock of  Autocarbon.com,  Inc.
subject to adjustment as provided herein)

                          COMMON STOCK PURCHASE WARRANT

No. ___                                               Issue Date:      , 2001

     Autocarbon.com,  Inc., a corporation  organized under the laws of the State
of  Delaware  (the  "Company"),  hereby  certifies  that,  for  value  received,
______________________ or permissable assigns, is entitled, subject to the terms
set forth below,  to purchase  from the Company after the Issue Date at any time
or from time to time  before  5:00 p.m.,  New York time,  on July 31,  2003 (the
"Expiration  Date"),  up to  _________  fully paid and  nonassessable  shares of
Common  Stock (as  hereinafter  defined),  $.0001  par value per  share,  of the
Company,  at a purchase  price of $0.25 per share of Common Stock (such purchase
price per share as adjusted from time to time as herein  provided is referred to
herein as the  "Purchase  Price").  The number and  character  of such shares of
Common  Stock and the  Purchase  Price are  subject to  adjustment  as  provided
herein.

     As used herein the following terms,  unless the context otherwise requires,
have the following respective meanings:

         (a)      The term Company  shall include  Autocarbon.com,  Inc. and any
         corporation   which  shall  succeed  or  assume  the   obligations   of
         Autocarbon.com, Inc. hereunder.

         (b)      The term  "Common  Stock"  includes (a) the  Company's  Common
         Stock,  $.0001 par value per share,  as  authorized  on the date of the
         Agreement, (b) any other capital stock of any class or classes (however
         designated)  of the  Company,  authorized  on or after such  date,  the
         holders of which shall have the right, without limitation as to amount,
         either to all or to a share of the  balance  of current  dividends  and
         liquidating  dividends after the payment of dividends and distributions
         on any shares  entitled to  preference,  and the holders of which shall
         ordinarily,  in the absence of  contingencies,  be entitled to vote for
         the  election of a majority of  directors  of the Company  (even if the
         right  so to  vote  has  been  suspended  by the  happening  of  such a
         contingency)  and (c) any other  securities into which or for which any
         of the securities described in (a) or (b) may be converted or exchanged
         pursuant to a plan of recapitalization, reorganization, merger, sale of
         assets or otherwise.

<PAGE>

         (c)      The term "Other  Securities"  refers to any stock  (other than
         Common  Stock) and other  securities of the Company or any other person
         (corporate  or  otherwise)  which the holder of the Warrant at any time
         shall be entitled to receive,  or shall have received,  on the exercise
         of the Warrant,  in lieu of or in addition to Common Stock, or which at
         any time shall be issuable or shall have been issued in exchange for or
         in replacement of Common Stock or Other Securities  pursuant to Section
         5 or otherwise.

1. Exercise of Warrant.

         1.1. Number of Shares  Issuable upon Exercise.  From and after the date
hereof  through and including the  Expiration  Date,  the holder hereof shall be
entitled to receive,  upon exercise of this Warrant in whole in accordance  with
the  terms  of  subsection  1.2 or  upon  exercise  of this  Warrant  in part in
accordance  with  subsection  1.3,  the number of shares of Common  Stock of the
Company identified on Page 1 hereof,  subject to adjustment  pursuant to Section
4.

         1.2. Full Exercise. This Warrant may be exercised in full by the holder
hereof by surrender of this Warrant,  with the form of subscription  attached as
Exhibit A hereto (the  Subscription  Form") duly executed by such holder, to the
Company  at its  principal  office  or at the  office of its  Warrant  agent (as
provided in Section  11),  accompanied  by payment,  in cash or by  certified or
official bank check payable to the order of the Company,  in the amount obtained
by  multiplying  the number of shares of Common  Stock for which this Warrant is
then exercisable by the Purchase Price (as hereinafter defined) then in effect.

         1.3. Partial  Exercise.  This Warrant may be exercised in part (but not
for a  fractional  share) by  surrender of this Warrant in the manner and at the
place provided in subsection 1.2 except that the amount payable by the holder on
such partial exercise shall be the amount obtained by multiplying (a) the number
of shares of Common Stock designated by the holder in the  Subscription  Form by
(b) the Purchase  Price.  On any such  partial  exercise,  the  Company,  at its
expense,  will  forthwith  issue and  deliver to or upon the order of the holder
hereof a new Warrant of like tenor,  in the name of the holder hereof or as such
holder  (upon  payment by such holder of any  applicable  transfer  taxes),  may
request,  the number of shares of Common  Stock for which such Warrant may still
be exercised.

<PAGE>

         1.4. Fair Market Value. Fair Market Value of a share of Common Stock as
of a particular date (the "Determination Date") shall mean the Fair Market Value
of a share of the Company's Common Stock. Fair Market Value of a share of Common
Stock as of a Determination Date shall mean:

         (a)      If the  Company's  Common Stock is traded on an exchange or is
quoted  on the  National  Association  of  Securities  Dealers,  Inc.  Automated
Quotation  ("NASDAQ") National Market System or the NASDAQ SmallCap Market, then
the closing or last sale price, respectively, reported for the last business day
immediately preceding the Determination Date.

         (b)      If the Company's  Common Stock is not traded on an exchange or
on the NASDAQ National Market System or the NASDAQ SmallCap Market but is traded
in the  over-the-counter  market,  then the mean of the  closing  bid and  asked
prices   reported  for  the  last   business  day   immediately   preceding  the
Determination Date.

         (c)      Except as  provided  in clause  (d)  below,  if the  Company's
Common Stock is not publicly traded, then as the Holder and the Company agree or
in the absence of agreement by  arbitration  in  accordance  with the rules then
standing of the American Arbitration Association,  before a single arbitrator to
be chosen from a panel of persons qualified by education and training to pass on
the matter to be decided.

         (d)      If the  Determination  Date  is  the  date  of a  liquidation,
dissolution or winding up, or any event deemed to be a liquidation,  dissolution
or winding up pursuant to the Company's charter,  then all amounts to be payable
per share to holders of the Common Stock pursuant to the charter in the event of
such  liquidation,  dissolution  or  winding  up,  plus all other  amounts to be
payable  per share in  respect  of the  Common  Stock in  liquidation  under the
charter,  assuming for the purposes of this clause (d) that all of the shares of
Common Stock then issuable upon exercise of all of the Warrants are  outstanding
at the Determination Date.

         1.5.  Company  Acknowledgment.  The  Company  will,  at the time of the
exercise of the Warrant,  upon the request of the holder hereof  acknowledge  in
writing its  continuing  obligation to afford to such holder any rights to which
such holder shall continue to be entitled after such exercise in accordance with
the  provisions  of this  Warrant.  If the  holder  shall  fail to make any such
request,  such failure shall not affect the continuing obligation of the Company
to afford to such holder any such rights.

         1.6.  Trustee  for Warrant  Holders.  In the event that a bank or trust
company  shall have been  appointed  as trustee for the holders of the  Warrants
pursuant to Subsection 3.1, such bank or trust company shall have all the powers
and duties of a warrant agent appointed pursuant to Section 10 and shall accept,
in its own name for the account of the Company or such  successor  person as may
be  entitled  thereto,  all  amounts  otherwise  payable to the  Company or such
successor,  as the case may be, on  exercise  of this  Warrant  pursuant to this
Section 1.

<PAGE>

         2. Delivery of Stock Certificates, etc. on Exercise. The Company agrees
that the shares of Common Stock purchased upon exercise of this Warrant shall be
deemed to be issued to the holder  hereof as the record  owner of such shares as
of the close of  business  on the date on which  this  Warrant  shall  have been
surrendered  and  payment  made  for  such  shares  as  aforesaid.  As  soon  as
practicable  after the exercise of this  Warrant in full or in part,  and in any
event  within 10 days  thereafter,  the  Company at its expense  (including  the
payment by it of any applicable issue taxes) will cause to be issued in the name
of and delivered to the holder  hereof,  or as such holder (upon payment by such
holder  of  any  applicable   transfer  taxes)  may  direct,  a  certificate  or
certificates  for  the  number  of duly  and  validly  issued,  fully  paid  and
nonassessable  shares of Common Stock (or Other Securities) to which such holder
shall be entitled on such  exercise,  plus, in lieu of any  fractional  share to
which such holder  would  otherwise  be  entitled,  cash equal to such  fraction
multiplied  by the then Fair Market Value of one full share,  together  with any
other stock or other securities and property  (including cash, where applicable)
to which such holder is  entitled  upon such  exercise  pursuant to Section 1 or
otherwise.

         3. Adjustment for Reorganization, Consolidation, Merger, etc.

         3.1. Reorganization, Consolidation, Merger, etc. In case at any time or
from  time  to  time,  the  Company  shall  (a)  effect  a  reorganization,  (b)
consolidate  with or  merge  into  any  other  person,  or (c)  transfer  all or
substantially all of its properties or assets to any other person under any plan
or arrangement  contemplating the dissolution of the Company, then, in each such
case,  as a condition  to the  consummation  of such a  transaction,  proper and
adequate  provision  shall be made by the  Company  whereby  the  holder of this
Warrant,  on the exercise  hereof as provided in Section 1 at any time after the
consummation of such  reorganization,  consolidation  or merger or the effective
date of such  dissolution,  as the case may be,  shall  receive,  in lieu of the
Common  Stock (or Other  Securities)  issuable  on such  exercise  prior to such
consummation or such effective date, the stock and other securities and property
(including  cash) to which  such  holder  would  have  been  entitled  upon such
consummation or in connection with such dissolution, as the case may be, if such
holder had so exercised this Warrant,  immediately prior thereto, all subject to
further adjustment thereafter as provided in Section 5.

         3.2.  Dissolution.  In the  event  of any  dissolution  of the  Company
following the transfer of all or substantially  all of its properties or assets,
the Company, prior to such dissolution, shall at its expense deliver or cause to
be delivered the stock and other securities and property  (including cash, where
applicable)  receivable by the holders of the Warrants, if exercised,  after the
effective date of such dissolution pursuant to this Section 3 to a bank or trust
company  having its principal  office in New York, NY, as trustee for the holder
or holders of the Warrants.

<PAGE>

         3.3.  Continuation of Terms.  Upon any  reorganization,  consolidation,
merger or transfer (and any dissolution  following any transfer)  referred to in
this  Section 3, this  Warrant  shall  continue in full force and effect and the
terms hereof shall be applicable to the shares of stock and other securities and
property  receivable on the exercise of this Warrant after the  consummation  of
such   reorganization,   consolidation  or  merger  or  the  effective  date  of
dissolution  following  any such  transfer,  as the case  may be,  and  shall be
binding upon the issuer of any such stock or other securities, including, in the
case of any such transfer,  the person acquiring all or substantially all of the
properties  or assets of the  Company,  whether  or not such  person  shall have
expressly assumed the terms of this Warrant as provided in Section 5.

         4.  Extraordinary  Events Regarding Common Stock. In the event that the
Company shall (a) issue  additional  shares of the Common Stock as a dividend or
other  distribution on outstanding  Common Stock,  (b) subdivide its outstanding
shares of Common  Stock,  or (c)  combine its  outstanding  shares of the Common
Stock into a smaller  number of shares of the Common  Stock,  then, in each such
event,  the Purchase  Price  shall,  simultaneously  with the  happening of such
event,  be adjusted by multiplying  the then Purchase  Price by a fraction,  the
numerator  of which  shall be the number of shares of Common  Stock  outstanding
immediately prior to such event and the denominator of which shall be the number
of shares of Common  Stock  outstanding  immediately  after such event,  and the
product so obtained shall  thereafter be the Purchase Price then in effect.  The
Purchase Price, as so adjusted,  shall be readjusted in the same manner upon the
happening of any successive  event or events described herein in this Section 4.
The  number of shares of Common  Stock  that the  holder of this  Warrant  shall
thereafter,  on the  exercise  hereof as  provided  in Section 1, be entitled to
receive shall be increased to a number  determined by multiplying  the number of
shares of Common  Stock that would  otherwise  (but for the  provisions  of this
Section 4) be issuable on such exercise by a fraction of which (a) the numerator
is the  Purchase  Price that would  otherwise  (but for the  provisions  of this
Section 4) be in effect, and (b) the denominator is the Purchase Price in effect
on the date of such exercise.

         5. Chief Financial  Officer's  Certificate as to  Adjustments.  In each
case of any adjustment or  readjustment  in the shares of Common Stock (or Other
Securities) issuable on the exercise of the Warrants, the Company at its expense
will promptly cause its Chief  Financial  Officer to compute such  adjustment or
readjustment  in  accordance  with  the  terms  of the  Warrant  and  prepare  a
certificate  setting forth such adjustment or readjustment and showing in detail
the facts upon which such  adjustment  or  readjustment  is based,  including  a
statement of (a) the consideration received or receivable by the Company for any
additional shares of Common Stock (or Other Securities) issued or sold or deemed
to have been issued or sold,  (b) the number of shares of Common Stock (or Other
Securities) outstanding or deemed to be outstanding,  and (c) the Purchase Price
and the number of shares of Common  Stock to be received  upon  exercise of this
Warrant,  in effect  immediately prior to such adjustment or readjustment and as
adjusted or readjusted as provided in this Warrant.  The Company will  forthwith
mail a copy of each  such  certificate  to the  holder  of the  Warrant  and any
Warrant agent of the Company (appointed pursuant to Section 10 hereof).

<PAGE>

         6.  Reservation  of  Stock,  etc.  Issuable  on  Exercise  of  Warrant;
Financial Statements.  The Company will at all times reserve and keep available,
solely for issuance and delivery on the exercise of the Warrants,  all shares of
Common Stock (or Other Securities) from time to time issuable on the exercise of
the Warrant.  This Warrant  entitles the holder hereof to receive  copies of all
financial and other information distributed or required to be distributed to the
holders of the Company's Common Stock.

         7.  Assignment;   Exchange  of  Warrant.  Subject  to  compliance  with
applicable  Securities laws, and delivery of such representations and warranties
as shall  reasonably be requested by the Company,  this Warrant,  and the rights
evidenced  hereby,  may  be  transferred  by any  registered  holder  hereof  (a
"Transferor")  with respect to any or all of the Shares.  On the  surrender  for
exchange  of this  Warrant,  with the  Transferor's  endorsement  in the form of
Exhibit B attached hereto (the Transferor  Endorsement  Form"),  to the Company,
the Company at its expense but with payment by the  Transferor of any applicable
transfer  taxes)  will issue and  deliver  to or on the order of the  Transferor
thereof a new Warrant or Warrants of like tenor,  in the name of the  Transferor
and/or the transferee(s)  specified in such Transferor  Endorsement Form (each a
"Transferee"),  calling in the  aggregate  on the face or faces  thereof for the
number of shares of Common  Stock called for on the face or faces of the Warrant
so surrendered by the Transferor.

         8.   Replacement  of  Warrant.   On  receipt  of  evidence   reasonably
satisfactory  to the Company of the loss,  theft,  destruction  or mutilation of
this Warrant  and, in the case of any such loss,  theft or  destruction  of this
Warrant,   on  delivery  of  an  indemnity   agreement  or  security  reasonably
satisfactory  in form and  amount  to the  Company  or,  in the case of any such
mutilation,  on surrender and  cancellation of this Warrant,  the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

         9.  Registration  Rights.  The holder of this  Warrant has been granted
certain  registration  rights by the Company.  These registration rights are set
forth in a  Subscription  Agreement  entered into by the initial  holder of this
Warrant and the  Company in  connection  with the  purchase of the Unit of which
this Warrant is a part. The terms of the Subscription Agreement and Registration
Rights Agreement referred to therein are incorporated herein by this reference.

         10.  Warrant  Agent.  The Company  may,  by written  notice to the each
holder of the Warrant, appoint an agent having an office in New York, NY for the
purpose of issuing  Common Stock (or Other  Securities)  on the exercise of this
Warrant  pursuant to Section 1, exchanging  this Warrant  pursuant to Section 7,
and replacing this Warrant  pursuant to Section 8, or any of the foregoing,  and
thereafter any such issuance, exchange or replacement, as the case may be, shall
be made at such office by such agent.

         11. Transfer on the Company's Books.  Until this Warrant is transferred
on the books of the Company,  the Company may treat the registered holder hereof
as the absolute owner hereof for all purposes, notwithstanding any notice to the
contrary.

<PAGE>

         12.  Call  Option.  The  Company  shall  have the  option to "call" the
Warrants (the "Warrant Call"), in accordance with and governed by the following:

         (a)      The Company shall  exercise the Warrant Call by giving to each
Warrant Holder a written notice of call (the "Call Notice") at any time prior to
the Expiration Date.

         (b)      The Warrant  Holders shall  exercise  their Warrant rights and
purchase the  appropriate  number of shares of Common Stock and pay for same all
within 10 business days of the date of the Call Notice.  Any Warrants  which are
Called and not exercised during such 10 business day period shall thereafter not
be exercisable.

         13. Notices, etc. All notices and other communications from the Company
to the  holder of this  Warrant  shall be mailed by first  class  registered  or
certified mail,  postage prepaid,  at such address as may have been furnished to
the Company in writing by such holder or, until any such holder furnishes to the
Company an  address,  then to, and at the  address  of, the last  holder of this
Warrant who has so furnished an address to the Company.

         14.  Miscellaneous.  This  Warrant  and any term hereof may be changed,
waived,  discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought.  This Warrant shall be construed and enforced in accordance  with and
governed by the laws of New York. Any dispute  relating to this Warrant shall be
adjudicated in New York State.  The headings in this Warrant are for purposes of
reference only, and shall not limit or otherwise affect any of the terms hereof.
The  invalidity  or  unenforceability  of any  provision  hereof shall in no way
affect the validity or enforceability of any other provision.

     IN WITNESS WHEREOF, the Company has executed this  Warrant under seal as of
the date first written above.

                             Autocarbon.com, Inc.

                             By:_______________________________

                             Title:____________________________

Witness:

__________________________

<PAGE>

                                    Exhibit A

                              FORM OF SUBSCRIPTION
                   (To be signed only on exercise of Warrant)

TO:         Autocarbon.com, Inc.

The undersigned,  the holder of the within Warrant, hereby irrevocably elects to
exercise this Warrant for, and to purchase thereunder, shares of Common Stock of
Autocarbon.com, Inc. and herewith makes payment of $ therefor, and requests that
the  certificates  for such  shares be issued in the name of, and  delivered  to
whose address is _______________________________________________________.

Dated:___________________

                                   _____________________________________________
                             (Signature must conform to name of holder as
                             specified on the face of the Warrant)

                             _____________________________________________
                             (Address)

<PAGE>

                                   Exhibit B

                         FORM OF TRANSFEROR ENDORSEMENT
                   (To be signed only on transfer of Warrant)

         For  value  received,   the  undersigned  hereby  sells,  assigns,  and
transfers  unto the person(s)  named below under the heading  "Transferees"  the
right represented by the within Warrant to purchase the percentage and number of
shares of Common  Stock of  Autocarbon.com,  Inc.  to which the  within  Warrant
relates  specified  under the  headings  "Percentage  Transferred"  and  "Number
Transferred," respectively,  opposite the name(s) of such person(s) and appoints
each such  person  Attorney  to transfer  its  respective  right on the books of
Autocarbon.com, Inc. with full power of substitution in the premises.

================================================================================
Transferees            Percentage            Number
                       Transferred           Transferred
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

================================================================================

Dated:                 , 200_                _______________________________
                                             (Signature must conform to name
                                              of holder as specified on the
                                              face of the warrant)
Signed in the presence of:

_______________________________      _______________________________
         (Name)                                (address)

                                    _______________________________
                                               (address)

ACCEPTED AND AGREED:
[TRANSFEREE]

_______________________________
         (Name)Exhibit 10.23

FOURTH AMENDMENT TO CREDIT AGREEMENT
------------------------------------

         THIS FOURTH  AMENDMENT TO CREDIT  AGREEMENT  ("Amendment")  is made and
entered into as of June 27, 2001 (the "Effective  Date"),  by and between NESCO,
Inc., an Oklahoma corporation (the "Borrower"),  and Bank One, Oklahoma, N.A., a
national banking association (the "Lender"), with reference to the following:

         A. The  Borrower  and the Lender are  parties  to that  certain  Credit
Agreement  dated as of May 12, 2000, as amended by that certain First  Amendment
to Credit  Agreement  dated as of August 4, 2000,  as  amended  by that  certain
Second  Amendment  to Credit  Agreement  dated as of  September  30, 2000 and as
further amended by that certain Third Amendment to Credit  Agreement dated as of
December 20, 2000 (as amended, the "Credit  Agreement").  Capitalized terms used
herein but not otherwise  defined have the respective  meanings assigned to them
in the Credit Agreement.

         B. The  Borrower has  requested  that the Lender (i) modify the rate of
interest applicable to the Facilities, (ii) apply a borrowing base limitation to
the Working Capital Revolving Credit Facility, (iii) extend the maturity date of
the Construction  Loan Facility,  (iv)  cross-collateralize  the Commercial Card
Purchase  Obligations  (as  hereinafter  defined)  with the  Obligations  of the
Borrower, and (v) otherwise modify certain covenants.

         C. The Lender has agreed to the foregoing changes, subject to the terms
and conditions set forth in this Amendment.

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  and  agreements  herein  contained,  and for other good and  valuable
consideration,  the receipt and adequacy of which are hereby  acknowledged,  the
parties hereby amend the Credit  Agreement,  effective as of the Effective Date,
as follows:

1.       INCREASE OF INTEREST APPLICABLE TO THE FACILITIES.  As of the Effective
Date,  the  formula  used in  computing  the  interest  rate  applicable  to the
Facilities  will  be  changed  so  that  the  interest  rate  applicable  to all
Facilities  will be equal to the Prime Rate,  plus three percent (3%) per annum.
Consequently,  the  Eurodollar  Rate will no longer  be  available  as a pricing
option for any Loans,  and the  Alternate  Base Rate will be modified  solely to
include a reference to the Prime Rate, and the  Applicable  Margin will be fixed
at  3.00%.  As a result,  as of the  Effective  Date all of the Loans  will bear
interest  at a rate of  Prime  Rate  plus  3.00%.  In order  to  effectuate  the
foregoing,  the  definitions of the terms  "Eurodollar  Base Rate,"  "Eurodollar
Loan," and "Eurodollar  Rate," together with all references to such terms in the
Credit  Agreement,  are deleted in their  entirety as of the Effective  Date. In
addition,  the  definitions of the terms  "Alternate  Base Rate" and "Applicable
Margin" appearing in Section 1.1 of the Credit Agreement are amended as follows:

         "Alternate  Base Rate" means,  for any day, a rate of interest equal to
the Prime Rate for such day.

                                       21
<PAGE>

         "Applicable  Margin"  means,  with  respect to Loans of any Type at any
time, an interest rate per annum of three percent (3.00%).

2.       APPLICATION  OF BORROWING  BASE. As of the Effective  Date, the parties
agree that the Working Capital  Revolving Credit Commitment will be subject to a
borrowing base  limitation  equal to  eighty-five  percent (85%) of the Eligible
Accounts (as hereafter defined). In order to effectuate the forgoing, the Credit
Agreement is amended in the following respects:

         A.  Additional  Definitions.  The  following  terms are hereby added to
Section 1.1 of the Credit Agreement:

                  "Accounts"   means  and   includes  all   accounts,   accounts
         receivable,  notes  receivable,  reimbursements  and  other  rights  to
         payment of the Borrower and its  Subsidiaries,  whether now existing or
         hereafter arising.

                  "Borrowing Base" means, as of any determination  date, the sum
         equal to eighty-five percent (85%) of Eligible Accounts.

                  "Borrowing Base Certificate" means a written certificate to be
         delivered by the Borrower pursuant to Section  6.1(xii),  substantially
         in the form of Exhibit F attached hereto.

                  "Eligible  Accounts" means, as of any determination  date, the
         aggregate  unpaid balance (net of interest,  finance charges and contra
         accounts) of Accounts (a) which arose from bona fide, outright sales of
         items of inventory or from the  performance of services by the Borrower
         and its Subsidiaries,  (b) if arising from sales of items of inventory,
         as to which the items of inventory  have been  delivered or shipped for
         delivery,  (c) which are based  upon  valid,  enforceable  and  legally
         binding  orders or contracts and invoiced in accordance  with the terms
         of such  orders or  contracts,  (d) for which the  account  debtors are
         unconditionally  obligated to make payment, and (e) in and to which the
         Bank has a valid and perfected first priority  security  interest.  The
         term shall exclude the following:

                  (i) Any Account  which is in dispute or as to which any of the
                  Borrower  or its  Subsidiaries  has  received  notice that the
                  account debtor claims right of rejection,  return, recoupment,
                  setoff, counterclaim,  deduction or defense to payment, to the
                  extent of the actual or asserted contra amount;

                  (ii) Any Account which is subject to any  assignment,  adverse
                  claim or Lien (except Permitted Liens);

                  (iii) Any Account which is evidenced by, or as to which any of
                  the Borrower or its Subsidiaries has received, a note, chattel
                  paper,  draft,  check, trade acceptance or other instrument in
                  payment thereof or obtained a judgment with respect thereto;

                                       22
<PAGE>

                  (iv)  Any  Account  as  to  which  the  account  debtor  is an
                  Affiliate of the Borrower;

                  (v)  Any  Account  as  to  which  the  account   debtor  is  a
                  Governmental Authority if the Bank is unable to obtain a valid
                  and  perfected  first  priority   security  interest  in  such
                  Account;

                  (vi) Any Account as to which the account debtor has died or is
                  the  subject  of  dissolution,   liquidation,  termination  of
                  existence,   insolvency,   business   failure,   receivership,
                  bankruptcy,  readjustment of debt,  assignment for the benefit
                  of creditors or similar proceedings;

                  (vii) Any Account which remains  unpaid for a period in excess
                  of two hundred  forty (240) days  beyond the  original  stated
                  invoice date that is due from any State Indemnity Fund Account
                  Debtor;

                  (viii)  All  Accounts  which are due from any State  Indemnity
                  Fund Account  Debtor who owes  Accounts  ten percent  (10%) or
                  more of which  remain  unpaid  for a period  in  excess of two
                  hundred  forty (240) days beyond the original  stated  invoice
                  date;

                  (ix) All Accounts which are due from any account debtor (other
                  than a State Indemnity Fund Account Debtor) who owes Accounts
                  ten percent (10%) or Fmore of which remain unpaid for a period
                  in excess of ninety (90) days beyond the original stated
                  invoice date;

                  (x) Any Account  which is due from an account  debtor who is a
                  Person not located in the United States or which is payable in
                  a  currency   other  than  U.S.   Dollars   (unless  the  Bank
                  determines,  in its sole  discretion,  to include such Account
                  and the Bank shall  have  first  received,  at its  option,  a
                  written  opinion in form and  substance,  and from counsel for
                  the Borrower,  satisfactory  to the Bank  reflecting  that all
                  necessary  steps have been taken to render the Bank's  Lien on
                  such  Account  properly  perfected  and of first  priority  or
                  backed by foreign credit insurance);

                  (xi) If the aggregate Accounts due from any account debtor
                  exceed twenty percent (20%) of the total Accounts outstanding
                  as of any determination date, the amount by which such
                  Accounts exceed twenty percent (20%) of the total Accounts;

                  (xii) Any Account that is a bonded account due from an account
                  debtor that is a contractor; and

                  (xiii)  Any  other  Account  as to  which  the Bank has made a
                  determination,  in the reasonable  exercise of its discretion,
                  that the prospects for collection are doubtful.

                                       23
<PAGE>

                  "State Indemnity Fund Account Debtor" means any account debtor
         of the Borrower or any of its Subsidiaries which is an entity,  fund or
         program that is subject to the Oklahoma  Petroleum  Storage Tank Reform
         Act (17 Okla. Stat. Secs. 321, et seq.).

         B.  Modification  of  Definition.  The definition of the following term
appearing  in Section 1.1 of the Credit  Agreement is amended in its entirety to
read as follows:

                           "Working Capital Revolving Credit  Commitment" means,
                  as of any  date  of  determination,  the  lesser  of:  (i) the
                  Borrowing   Base  as  of  such  date,  and  (ii)  the  sum  of
                  $6,500,000,  or such other amount to which the Working Capital
                  Revolving Credit  Commitment may be modified from time to time
                  pursuant  to  the  terms  hereof.  As  the  context  requires,
                  "Working Capital  Revolving Credit  Commitment" also refers to
                  the obligation of the Lender to make Working Capital Revolving
                  Loans and  issue  Facility  LC's  under  the  Working  Capital
                  Revolving Loan Facility.

         C. Borrowing Base  Certificate.  The Borrower  covenants to provide the
Lender a Borrowing  Base  Certificate on or before the 20th day of each calendar
month calculated as of the last day of the immediately preceding calendar month.
In order to effectuate  the foregoing,  as of the Effective  Date, the following
Section 6.1(xii) is hereby added to the Credit Agreement:

                  (xii) On or  before  the 20th day of each  calendar  month,  a
         Borrowing  Base  Certificate  signed by an  Authorized  Officer  of the
         Borrower  certifying as to the matters  involved in the  calculation of
         the Borrowing Base as of the end of the immediately  preceding calendar
         month.

3.       USE OF WORKING CAPITAL REVOLVING CREDIT FACILITY PROCEEDS.  The parties
hereby agree that proceeds from the Working  Capital  Revolving  Credit Facility
Proceeds  may no longer be used by the  Borrower  in any amount to  finance  the
Borrower's  purchase of shares of its capital stock from Patterson.  In order to
effectuate the foregoing,  the Credit Agreement is amended,  as of the Effective
Date, as follows:

         A. Section 2.2.1 Modification. Section 2.2.1 of the Credit Agreement is
modified as of the  Effective  Date by: (i) deleting in its entirety  subsection
(iv), and (ii)  correspondingly  inserting the appropriate  modifications to the
punctuation of that Section.

         B.  Section 6.2  Modification.  Section 6.2 of the Credit  Agreement is
modified as of the Effective  Date by deleting the  following  language from the
second paragraph of that Section: "; provided, however, that up to $1,000,000 of
the  proceeds  of a Working  Capital  Revolving  Loan may be used to finance the
Borrower's  purchase of shares of its capital stock,  as contemplated by Section
2.2.1(iv)". In all other respects, Section 6.2 shall remain unaltered.

                                       24
<PAGE>

4.       MODIFICATION OF CONSTRUCTION LOAN FACILITY.
         ------------------------------------------

         A. Extension of Maturity  Date. As of the Effective  Date, the maturity
date of all  outstanding  Construction  Loans and all other  unpaid  Obligations
arising  under or relating to the  Construction  Loan  Facility  will be due and
payable in full on August 10, 2001.

         B. Replacement  Construction Note. The Borrower agrees to make, execute
and  deliver to the Lender a  replacement  Construction  Note (the  "Replacement
Construction  Note"),  substantially  in the form  attached  hereto  as  Exhibit
"D-6B," in replacement of and substitution  for, but not in satisfaction or as a
novation of, the Construction  Note dated as of December 20, 2000,  delivered in
connection  with the  execution  and  delivery of the Third  Amendment to Credit
Agreement. The parties agree that, from and after the Effective Date, unless the
context  otherwise  requires:  (i) all  references  to the  "Construction  Note"
appearing  in the Credit  Agreement or any other Loan  Documents  shall mean and
refer to the Replacement  Construction Note, together with any and all renewals,
extensions  or  replacements  thereof,  amendments or  modifications  thereto or
substitutions  therefor,  and (ii) the term "Loan  Documents"  shall include the
Replacement Construction Note.

         C. Extension Fee. In consideration of the Lender's  agreement to extend
the Construction  Loan Facility,  the Borrower agrees to pay the Lender a fee of
$15,000.

         5.  CROSS-COLLATERALIZATION OF COMMERCIAL CARD PURCHASE FACILITY. As of
the Effective Date, any and all obligations and  Indebtedness  accrued under the
Commercial  Card  Purchase  Facility  (as such term is defined  below)  shall be
cross-collateralized  to the  Obligations  of the Borrower,  and shall enjoy the
same rights under the Collateral Documents as all other Loans made under Article
2 of the Credit Agreement.  The Borrower  acknowledges  that, as a result of the
amendment  to  the  definition  of  the  term  "Obligations"  effected  by  this
Amendment,  the prompt payment of all Commercial  Card Purchase  Obligations (as
such term is  defined  below)  will be secured  by a valid and  perfected  first
priority  security  interest  in all  of the  now  existing  and  after-acquired
tangible and  intangible  Property of the Borrower and each of its  Subsidiaries
and all  Collateral  Documents and will  guaranteed by the Guaranty  executed by
each of the  Subsidiaries.  In order to  effectuate  the  foregoing,  the Credit
Agreement is amended as of the date hereof in the following respects:

         A. New  Definitions.  The following  definitions  of  "Commercial  Card
Purchase  Facility" and "Commercial Card Purchase  Obligations" are hereby added
to Section 1.1 of the Credit Agreement (to be inserted in alphabetical order):

         (i)  "Commercial  Card Purchase  Facility"  means the  Commercial  Card
Purchase  Facility  established  by that  certain  agreement  entered into as of
August 21, 2000  between the Borrower  and the Lender  pursuant to which,  among
other things, the Lender agreed to provide a system to Borrower to process small
purchases  and reduce the need for the Borrower to process  vendor  invoices and
process checks.

                                       25
<PAGE>

                  (ii) "Commercial Card Purchase Obligations" of a Person means
         any and all obligations of such Person, whether absolute or contingent,
         now existing or hereafter created, arising or acquired (including all
         renewals, extensions and modifications thereof and substitutions
         therefor), under the Commercial Card Purchase Facility.

         B.  Amended  Definitions.  The  definitions  of the term  "Obligations"
appearing in Section 1.1 of the Credit  Agreement  is hereby  amended to include
the  "Commercial  Card  Purchase   Obligations."  In  order  to  effectuate  the
foregoing,  the definition of the term  "Obligations" is deleted in its entirety
from Section 1.1 of the Credit Agreement and replaced with the following:

"Obligations"  means  all  Commercial  Card  Purchase Obligations and all unpaid

                  principal of and accrued and unpaid interest on the Loans, all
                  accrued  and  unpaid  fees and all  expenses,  reimbursements,
                  indemnities  and  other  obligations  of the  Borrower  to the
                  Lender  or  any  indemnified  party  arising  under  the  Loan
                  Documents.

6.       CONDITIONS  PRECEDENT.  This Amendment shall become effective as of the
Effective  Date,  subject  to  the  Borrower's  satisfaction  of  the  following
conditions  precedent  (in  addition to the  conditions  precedent  set forth in
Article IV of the Credit Agreement):

         A.  Execution  of  Documents.   This  Amendment  and  the   Replacement
Construction  Note shall have been duly and  validly  authorized,  executed  and
delivered  to the Lender by the  Borrower,  and the  "Consent  of  Subsidiaries"
appearing after the Borrower's  signature to this Amendment shall have been duly
and validly authorized,  executed and delivered to the Lender by each Subsidiary
of the Borrower.

         B. Resolutions.  The Bank shall have received a copy of the resolutions
of the Board of Directors of the Borrower  authorizing  the execution,  delivery
and  performance  of this  Amendment,  the Credit  Agreement (as amended by this
Amendment) and the Replacement Construction Note.

         C. Accuracy of Representations and Warranties.  All representations and
warranties  made by the  Borrower  in the  Credit  Agreement  and the other Loan
Documents  and in Section 5 hereof  shall be true and  correct  in all  material
respects  as  of  the  Effective   Date  (except  to  the  extent  any  of  such
representations  and warranties  with respect to the financial  condition of the
Borrower refer to an earlier specified date).

         D. No Default.  There shall not have  occurred any Default or Unmatured
Default as of the Effective  Date,  and the Borrower shall be current in payment
of all  principal,  interest  and fees due and  owing  to the  Lender  as of the
Effective Date.

         E. Fee. The Borrower shall have paid the fee referred to in Section 2.C
above.

7.       REPRESENTATIONS  AND WARRANTIES.  All representations and warranties of
Borrower  contained in Article V of the Credit  Agreement  are hereby remade and
restated as the date hereof and shall survive the execution and delivery of this
Amendment. The Borrower further represents and warrants as follows:

                                       26
<PAGE>

         A.  Authority.  The Borrower has all requisite  power and authority and
has  been  duly  authorized  to  agree  to the  increase  in the  interest  rate
applicable to the Facilities,  the extension of the maturity of the Construction
Loan  Facility,  the  cross-collateralization  of the  Commercial  Card Purchase
Facility,  and to  execute,  deliver  and  perform  its  obligations  under this
Amendment,  the  Credit  Agreement  (as  amended  by  this  Amendment)  and  the
Replacement Construction Note.

         B. Binding  Obligations;  Enforceability.  This  Amendment,  the Credit
Agreement (as amended by this Amendment) and the Replacement  Construction  Note
are valid and  legally  binding  obligations  of the  Borrower,  enforceable  in
accordance  with  their  respective  terms,  except  as  limited  by  applicable
bankruptcy,  insolvency or other laws  affecting the  enforcement  of creditors'
rights generally.

         C. No Conflict;  Government Consent. Neither the execution and delivery
by the Borrower of this Amendment and the Replacement Construction Note, nor the
consummation  of the  transactions  herein  contemplated  or compliance with the
provisions  hereof and  thereof,  will  violate (i) any law,  rule,  regulation,
order, writ,  judgment,  injunction,  decree or award binding on the Borrower or
any of its Subsidiaries,  or (ii) the Borrower's or any Subsidiary's articles or
certificate of incorporation, partnership agreement, certificate of partnership,
articles  or  certificate  of  organization,  by-laws,  or  operating  or  other
management  agreement,  as the  case  may be,  or (iii)  the  provisions  of any
indenture,  instrument  or  agreement  to  which  the  Borrower  or  any  of its
Subsidiaries  is a party or is  subject,  or by which  it, or its  Property,  is
bound,  or conflict  with or constitute a default  thereunder,  or result in, or
require, the creation or imposition of any Lien in, of or on the Property of the
Borrower or any of its Subsidiaries pursuant to the terms of any such indenture,
instrument or agreement.  No order, consent,  adjudication,  approval,  license,
authorization,  or validation of, or filing,  recording or registration with, or
exemption by, or other action in respect of any  governmental  or public body or
authority,  or any  subdivision  thereof,  which  has not been  obtained  by the
Borrower or any of its Subsidiaries,  is required to be obtained by the Borrower
or any of its Subsidiaries in connection with the execution and delivery of this
Amendment, the borrowings and other credit extensions under the Credit Agreement
(as  amended  hereby),  the  payment  and  performance  by the  Borrower  of the
Obligations, or the legality, validity, binding effect or enforceability of this
Amendment,  the  Credit  Agreement  (as  amended  by  this  Amendment)  and  the
Replacement Construction Note.

         D. No Material  Adverse  Change.  Since March 31, 2001 (the date of the
latest  financial  statements of the Borrower  which have been  delivered to the
Lender), there has been no adverse change in the business, Property,  prospects,
condition  (financial or otherwise) or results of operations of the Borrower and
its  Subsidiaries  which could reasonably be expected to have a Material Adverse
Effect.

                                       27
<PAGE>

8.       MISCELLANEOUS.
         -------------

         A.  Effect  of  Amendment.   The  terms  of  this  Amendment  shall  be
incorporated  into and form a part of the Credit  Agreement.  Except as amended,
modified and supplemented by this Amendment,  the Credit Agreement and all other
Loan Documents  shall continue in full force and effect in accordance with their
original stated terms, all of which are hereby reaffirmed in every respect as of
the date hereof. In the event of any  irreconcilable  inconsistency  between the
terms of this Amendment and the terms of the Credit Agreement, the terms of this
Amendment shall control and govern,  and the agreements  shall be interpreted so
as to carry out and give full effect to the intent of this Amendment.

         B. References to Defined Terms. The parties  acknowledge and agree that
the terms  "Loans" and  "Obligations"  as used in the Credit  Agreement  and any
other Loan  Documents  will include all  Commercial  Card  Purchase  Obligations
outstanding under the Commercial Card Purchase Facility. Further, all references
to the "Credit Agreement" appearing in any of the Loan Documents shall hereafter
be  deemed  references  to  the  Credit  Agreement  as  amended,   modified  and
supplemented by this Amendment.

         C. Exhibits. The form of Replacement  Construction Note attached hereto
as Exhibit D-6B is hereby  substituted  for Exhibit D-6 to the Credit  Agreement
and incorporated therein by this reference.

         D.  Descriptive  Headings.  The  descriptive  headings  of the  several
sections of this  Amendment are inserted for  convenience  only and shall not be
used in the construction of the content of this Amendment.

         E.  Governing  Law. This  Amendment  shall be construed and enforced in
accordance with, and the rights of the parties shall be governed by, the laws of
the State of Oklahoma.

         F. Reimbursement of Expenses. The Borrower agrees to pay the reasonable
fees and  out-of-pocket  expenses  of Crowe & Dunlevy,  counsel  to the  Lender,
incurred  in  connection   with  the  preparation  of  this  Amendment  and  the
consummation of the transactions contemplated hereby.

         IN WITNESS  WHEREOF,  the  Borrower and the Lender have  executed  this
Agreement as of the date first above written.

                                  NESCO, INC.,
                                  an Oklahoma corporation

                                  By:   /s/ Larry G. Johnson
                                      ------------------------------------------
                                  Name:   Larry G. Johnson
                                  Title:  Vice President & Secretary-Treasurer

                                  BANK ONE, OKLAHOMA, N.A.,
                                  a national banking association

                                  By:   /s/ Tipton J. Burch
                                      ------------------------------------------
                                  Name:   Tipton J. Burch
                                  Title:  First Vice President

                                       28
<PAGE>

                                CONSTRUCTION NOTE

$8,000,000                                                        June ___, 2001

         NESCO, Inc., an Oklahoma corporation (the "Borrower"),  promises to pay
to the order of Bank One,  Oklahoma,  NA (the  "Lender"),  the aggregate  unpaid
principal  amount of all  Construction  Loans made by the Lender to the Borrower
pursuant to  Construction  Loan  Facility  established  under the  Agreement (as
hereinafter  defined),  in immediately available funds at the main office of the
Lender,  together  with  interest on the unpaid  principal  amount hereof at the
rates and on the dates set forth in the  Agreement.  The Borrower  shall pay the
principal of and accrued and unpaid interest on the  Construction  Loans in full
on August 10, 2001, and prior to maturity shall make such mandatory  payments as
are required to be made under the terms of Article II of the Agreement.

         The Lender shall,  and is hereby  authorized to, record on the schedule
attached  hereto,  or to otherwise record in accordance with its usual practice,
the date and  amount of each  Construction  Loan and the date and amount of each
principal payment hereunder.

         This Note is the Construction  Note issued pursuant to, and is entitled
to the benefits of, the Credit Agreement dated as of May 12, 2000, as amended by
the First  Amendment to Credit  Agreement dated as of August 4, 2000, as amended
by the Second  Amendment to Credit  Agreement dated as of September 30, 2000, as
amended by the Third Amendment to Credit Agreement dated as of December 20, 2000
and as further amended by the Fourth  Amendment to Credit Agreement of even date
herewith  (which,  as it may be further  amended or modified  and in effect from
time to time,  is herein called the  "Agreement"),  between the Borrower and the
Lender, to which Agreement reference is hereby made for a statement of the terms
and  conditions  governing this Note,  including the terms and conditions  under
which this Note may be prepaid or its maturity  date  accelerated.  This Note is
secured pursuant to the Collateral Documents, all as more specifically described
in the Agreement, and reference is made thereto for a statement of the terms and
provisions  thereof.  Capitalized  terms used herein and not  otherwise  defined
herein are used with the meanings attributed to them in the Agreement.

                                 NESCO, INC.,
                                 an Oklahoma corporation

                                 By:   /s/ Larry G. Johnson
                                     -------------------------------------------
                                 Name:    Larry G. Johnson
                                 Title:   Vice President & Secretary-Treasurer

                                       29

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