Document:

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                                                                   Exhibit 10.40

NEITHER THIS NOTE NOR ANY SECURITIES WHICH MAY BE ISSUED UPON THE EXERCISE
OF THE WARRANTS HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED, OR REGISTERED OR OTHERWISE QUALIFIED UNDER ANY STATE
SECURITIES LAW. NEITHER THIS NOTE NOR ANY SUCH SECURITIES MAY BE SOLD OR
OFFERED FOR SALE IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
UNDER SAID ACT AND REGISTRATION OR OTHER QUALIFICATION UNDER ANY APPLICABLE
STATE SECURITIES LAWS, OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION OR OTHER QUALIFICATION IS NOT REQUIRED.

THIS NOTE IS SUBJECT TO THE TERMS OF THE SUBORDINATION AGREEMENT (AS
DEFINED HEREIN IN SECTION 8) IN FAVOR OF PNC BANK, NATIONAL ASSOCIATION, AS
AGENT FOR CERTAIN BANKS. NOTWITHSTANDING ANY CONTRARY STATEMENT CONTAINED
IN THE WITHIN INSTRUMENT, NO PAYMENT ON ACCOUNT OF ANY OBLIGATION ARISING
FROM OR IN CONNECTION WITH THE WITHIN INSTRUMENT OR ANY RELATED AGREEMENT
(WHETHER OF PRINCIPAL, INTEREST OR OTHERWISE) SHALL BE MADE, PAID, RECEIVED
OR ACCEPTED EXCEPT IN ACCORDANCE WITH THE TERMS OF THE SUBORDINATION
AGREEMENT.

                          CECO Environmental Corp.
                          ------------------------
                      AMENDED AND RESTATED REPLACEMENT
                              PROMISSORY NOTE
                              ---------------

$500,000                                                            May 1, 2001

     WHEREAS, ICS Trustee Services Ltd. has prior to this date advanced $500,000
(the "Advance") to CECO Environmental Corp.

     WHEREAS, the terms of the Advance are set forth in a Replacement Promissory
Note dated March 12, 2001 (the "Prior Note"), which Prior Note shall be
cancelled and replaced by this Amended and Restated Replacement Promissory Note.

     WHEREAS, ICS Trustee Services Ltd. has assigned the Prior Note to Taurus
Capital Markets Ltd.

     FOR VALUE RECEIVED, the undersigned, CECO Environmental Corp. (the
"Company"), a New York corporation, hereby promises to pay to the order of
Taurus Capital Markets Ltd. or registered assigns ("Holder"), the principal sum
of FIVE HUNDRED THOUSAND DOLLARS ($500,000.00) on the Maturity Date, as defined
in Section 1 below. This Note is part of a series of Notes of like tenor and
effect to this Note in the aggregate principal amount of $5,000,000 to be issued
in connection with a mezzanine financing by the Company (the "1999 Subordinated
Notes").

     1. Maturity. This Note shall be due and payable upon the earlier to occur
        --------
of the following events (the "Maturity Date"): (i) six and one-half (6 1/2)
years from December 7, 1999; (ii) six (6) months after repayment of the Superior
Debt (as defined in Section 8 below); or (iii) the

                                       1

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closing (any such closing referred to as the "Closing") of a Sale Transaction.
For purposes of this Note, a Sale Transaction shall mean (i) a merger,
consolidation, corporate reorganization, or sale of shares of stock of the
Company as a result of which there is a change in control and/or the
shareholders of the Company on the date hereof ("Current Shareholders") own 50%
or less of the outstanding shares of the Company on a fully-diluted basis
immediately after the transaction and, including as outstanding for purposes of
such calculation, any warrants, options or other instruments convertible or
exchangeable into equity securities of the Company issued to persons other than
the Current Shareholders in connection with the transaction or (ii) the sale of
(A) fifty percent or more of the assets of the Company or (B) any subsidiary,
division or line of business of the Company for total consideration in excess of
$5 million.

     2. Interest. Interest shall accrue on the unpaid principal balance hereof
        --------
and on any interest payment that is not made when due at the simple compounded
rate of twelve percent (12%) per annum from the date hereof. Accrued Interest
shall be due and payable on June 30 and December 31 of each year commencing June
30, 2000 and on the Maturity Date. Notwithstanding the foregoing, interest due
under this note on June 30, 2000 and December 31, 2000, will be paid in
accordance with the terms of the Subordination Agreement. It shall not be a
default hereunder and interest will not accrue on any portion of such interest
payments deferred pursuant to the Subordination Agreement ("Deferred Interest")
so long as the Deferred Interest is paid at the time and in the manner allowed
by the Subordination Agreement. In the Event of Default (as defined herein),
interest shall accrue on all unpaid amounts due hereunder including without
limitation, interest, at the rate of fifteen percent (15%) per annum. If a
judgment is entered against the Company on this Note, the amount of the judgment
so entered shall bear interest at the highest rate authorized by law as of the
date of the entry of the judgment.

     3. Payments. Payments of both principal and interest shall be made at the
        --------
principal executive office of the Company, or such other place as the holder
hereof shall designate to the Company in writing, in lawful money of the United
States of America.

          So long as no Event of Default has occurred in this Note, all payments
hereunder shall first be applied to interest, then to principal. Upon the
occurrence of an Event of Default in this Note, all payments hereunder shall
first be applied to costs pursuant to Section 13.5, then to interest and the
remainder to principal.

     4. Registration, Transfer and Exchange of Notes. The Company will keep at
        --------------------------------------------
its principal office a register in which it will provide for the registration of
and transfer of this Note, at its own expense (excluding transfer taxes). If any
Note is surrendered at said office or at the place of payment named in the Note
for registration of transfer or exchange (accompanied in the case of
registration of transfer or exchange by a written instrument of transfer in form
satisfactory to the Company duly executed by or on behalf of the holder), the
Company, at its expense, will deliver in exchange one or more new Notes in
denominations of $10,000 or larger multiples of $1,000, as requested by the
holder for the aggregate unpaid principal amount. Any Note or Notes issued in a
transfer or exchange shall carry the same rights to increase Notes surrendered.
The Holder agrees that prior to making any sale, transfer, pledge, assignment,
hypothecation, or other disposition (each, a "Transfer") of the Note, the Holder
shall give written notice to the Company describing the manner in which any such
proposed Transfer is to be made and providing such additional

                                       2

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information and documentation regarding the Transfer as the Company reasonably
requests. If the Company so requests, the Holder shall at his expense provide
the Company with an opinion of counsel (which counsel must be reasonably
satisfactory to the Company, to the holder, in form and substance satisfactory
to the Company) that the proposed Transfer complies with applicable federal and
state securities laws. The Company shall have no obligation to Transfer any
Notes unless the holder thereof has complied with the foregoing provisions, and
any such attempted Transfer shall be null and void.

     5. Registered Owner. Prior to due presentation for registration of
        ----------------
transfer, the Company may treat the person in whose name any Note is registered
as the owner and holder of such Note for the purpose of receiving payment of
principal of, and interest on, such Note and for all other purposes.

     6. Prepayment.
        ----------

          6.1 Optional Prepayment. The Company, at its option and without any
              -------------------
     premium, may prepay in whole or in part the principal amount of this Note
     at 100% of the face value of the Note at any time; provided, however, that
     if the Company intends to prepay any one or more of the 1999 Subordinated
     Notes in part, it shall prepay the same percentage of each outstanding 1999
     Subordinated Note. The Company shall, at the time of any such prepayment,
     pay to the holder of this Note all interest accrued and unpaid to the
     Prepayment Date (defined below). Notwithstanding the foregoing, once a
     notice of the Closing of a Sale Transaction pursuant to Section 13.4 has
     been sent to the Holder, the Company may not prepay this Note prior to the
     Closing of a Sale Transaction, or until the Sale Transaction has been
     formally abandoned.

          6.2 Notice of Prepayment. At least five (5) but not more than fifteen
              -------------------
     (15) days prior to the date fixed for any prepayment, written notice shall
     be given to the holders of the 1999 Subordinated Notes of the election of
     the Company to prepay all or a specified portion of the principal amount of
     the Note (the "Prepayment Notice.") The Prepayment Notice shall specify the
     date upon ("Prepayment Date") and the place at which, payment may be
     obtained and shall call upon the Holder to surrender this Note to the
     Company in the manner and at the place designated. On the Prepayment Date,
     the Holder shall surrender this Note to the Company in the manner and at
     the place designated in the Prepayment Notice, and thereupon prepayment
     shall be made to Holder and this Note shall be cancelled. In the event that
     less than all of the principal amount of this Note is prepaid, upon
     surrender of this Note to the Company, the Company shall execute and
     deliver to Holder a new Note or Notes in principal amount equal to the
     unpaid principal amount of this Note.

          6.3 Cessation of Rights. From and after the Prepayment Date, unless
              -------------------
     there has been a default under the Prepayment Notice, all interest on the
     redeemed principal amount shall cease to accrue and all rights of Holder as
     a Holder of this Note shall cease with respect to the principal amount
     prepaid and, with respect to such amount, this Note thereafter shall not be
     deemed to be outstanding for any purpose whatsoever. By acceptance of this
     Note, Holder agrees to execute and deliver such documents as may be
     reasonably

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     requested from time to time by the Company in order to implement the
     foregoing provisions of this Section.

     7. Warrant Coverage. Holder shall receive, on the date hereof, ten-year
        ----------------
warrants (the "Warrants) to purchase 100,000 shares of common stock of the
Company ("Common Stock"). The exercise price of the Warrants shall be $2.25 per
share of Common Stock of the Company ("Exercise Price") and shall become
exercisable six months after the date hereof. The Warrants shall contain the
terms and shall be in the form attached hereto, as Exhibit A.

     The holders of the Warrant shall have registration rights in accordance
with the terms as set forth in the a Warrant Agreement in the form attached as
Exhibit B.

     8. Subordination. The indebtedness evidenced by this Note shall at all
        -------------
times be wholly subordinate and junior in right of payment to all obligations of
the Company under or in connection with the Credit Agreement of even date
herewith ("Superior Debt") among the Company as guarantor, the borrowers CECO
Group Inc., CECO Filters, Inc., Air Purator Corporation, New Bush Co., Inc.,
U.S. Facilities Management, Inc., The Kirk & Blum Manufacturing Company, and
kbd/Technic, Inc., and the lenders PNC Bank, National Association and various
other financial institutions, upon the terms and conditions contained in the
Subordination Agreement between Green Diamond Oil Corp., Harvey Sandler, ICS
Trustee Services, Ltd., and PNC Bank, National Association and various other
financial institutions of even date herewith (the "Subordination Agreement").

     9. Repayment of Notes. In the event the Company completes an equity
        ------------------
financing or offering or a series of equity financing or offerings for a total
consideration in excess of $10,000,000, then twenty-five percent (25%) of all
such consideration in excess of $10,000,000 shall be used immediately, upon
receipt by the Company, to pre-pay the 1999 Subordinated Notes, provided such
prepayment shall be made proportionately among the 1999 Subordinated Notes until
the 1999 Subordinated Notes are paid in full.

     10. Covenants of the Company. The Company covenants and agrees that it
         ------------------------
shall not, without the prior written approval of the Holders of a majority of
the aggregate principal amount outstanding of the 1999 Subordinated Notes
("Majority Holders"):

          10.1 Obtain or incur any indebtedness or other monetary obligations
     that are senior to or on parity with the Notes, other than the Superior
     Debt.

          10.2 Allow, suffer or cause to exist any lien, claim, security
     interest or encumbrance on the Company's property or assets, other than
     with respect to the Superior Debt and purchase money indebtedness incurred
     in the ordinary course of business.

          10.3 Enter into any arrangement or agreement involving the merger or
     consolidation of the Company.

          10.4 Use the proceeds from the sale of the 1999 Subordinated Notes
     other than in the ordinary course of its business for general corporate
     purposes including lending monies

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<PAGE>

     to any of its subsidiaries. The Company also covenants and agrees that it
     shall operate its business in the ordinary course.

     11. Events of Default.
         -----------------

          11.1 Occurrences of Events of Default. Each of the following events
               --------------------------------
     shall constitute an "Event of Default" for purposes of this Note:

               (a) if the Company fails to pay any amount payable, under this
          Note when due;

               (b) if the Company breaches any of its representations,
          warranties or covenants set forth in this Note or the Warrant
          Agreement;

               (c) the commencement of an involuntary case against the Company
          or its subsidiary or any of its subsidiaries under any applicable
          bankruptcy, insolvency or other similar law now or hereafter in
          effect, or the appointing of a receiver, liquidator, assignee,
          custodian, trustee or similar official of the Company or for any
          substantial part of the Company or one of its subsidiary's property,
          or ordering the winding-up or liquidation of the Company or one of its
          subsidiary's affairs;

               (d) if the Company or any of its subsidiaries shall commence a
          voluntary case under any applicable bankruptcy, insolvency or other
          similar law now or hereafter in effect, or shall consent to the entry
          of an order for relief in an involuntary case under any such law, or
          shall consent to the appointment of or taking possession by a
          receiver, liquidator, assignee, trustee, custodian or similar official
          of the Company or its subsidiary or for any substantial part of the
          Company or one of its subsidiary's property, or shall make any general
          assignment for the benefit of creditors, or shall take any corporate
          action in furtherance of any of the foregoing; or

               (e) if the Company's business shall fail, as determined in good
          faith by the Majority Holders and evidenced by the Company's inability
          to pay its ongoing debts as such debts become due.

          11.2 Acceleration Upon Event of Default. If any Event of Default shall
               ----------------------------------
     have occurred and be continuing, for any reason whatsoever (and whether
     such occurrence shall be voluntary or involuntary or come about or be
     effected by operation of law or otherwise), the unpaid principal amount of,
     and the accrued interest on, the Notes shall automatically become
     immediately due and payable, without presentment, demand, protest or other
     requirements of any kind, all of which are hereby expressly waived by the
     Company.

     12. Investment Representations of the Holder. With respect to the purchase
         ----------------------------------------
of this Note, the Common Stock issuable upon the exercise of the Warrants
(collectively, the "Securities"), the Holder hereby represents and warrants to
the Company as follows:

          12.1 Experience. The Holder has substantial experience in evaluating
               ----------
     and investing in private placement transactions of securities in companies
     similar to the

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     Company so that it is capable of evaluating the merits and risks of its
     investment in the Company and has the capacity to protect its own
     interests.

          12.2 Investment. The Holder is acquiring the Securities for investment
               ----------
     for its own account, not as a nominee or agent, and not with the view to,
     or for resale in connection with, any distribution thereof. The Holder
     understands that the Securities have not been, and will not be, registered
     under the Securities Act of 1933, as amended ("Securities Act"), by reason
     of a specific exemption from the registration provisions of the Securities
     Act, the availability of which depends upon, among other things, the bona
     fide nature of the investment intent and the accuracy of the Holder's
     representations as expressed herein. The holder is an "accredited investor"
     within the meaning of Regulation D, Section 501(a), promulgated by the
     Securities and Exchange Commission.

          12.3 Rule 144. The Holder acknowledges that the Securities must be
               --------
     held indefinitely unless subsequently registered under the Securities Act,
     or unless an exemption from such registration is available. The Holder
     understands that at this time the Company is not under any obligation to
     register any of the Securities. The Holder is aware of the provisions of
     Rule 144 promulgated under the Securities Act that permit limited resale of
     securities purchased in a private placement subject to satisfaction of
     certain conditions.

          12.4 No Public Market. The Holder understands that no public market
               ----------------
     now exists for any of the Securities issued by the Company and that the
     Company has made no assurances that a public market will ever exist for the
     Securities.

          12.5 Access to Data. The Holder has had an opportunity to discuss the
               --------------
     Company's business, management and financial affairs with the Company's
     management and has also had an opportunity to ask questions of the
     Company's officers, which questions were answered to its satisfaction.

     13. Miscellaneous.
         -------------

          13.1 Invalidity of Any Provision. If any provision or part of any
               ---------------------------
     provision of this Note shall for any reason be held invalid, illegal or
     unenforceable in any respect, such invalidity, illegality or
     unenforceability shall not affect any other provisions of this Note and
     this Note shall be construed as if such invalid, illegal or unenforceable
     provisions or part hereof had never been contained herein, but only to the
     extent of its invalidity, illegality or unenforceability.

          13.2 Governing Law. The Note shall be governed in all respects by the
               -------------
     laws of the State of New York, excluding its conflict of laws.

          13.3 Notices. Any notice or other communication required or permitted
               -------
     hereunder shall be in writing and shall be deemed to have been duly given
     (i) on the date of delivery if delivered personally, (ii) one (1) business
     day after transmission by facsimile transmission with a written
     confirmation copy sent by first class mail, or (iii) five (5) days after
     mailing if mailed by first class mail, to the following addresses:

                                       6

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     If to the Company:         CECO Environmental Corp.
                                505 University Avenue, Suite 1400
                                Toronto, Ontario M5G 1X3
                                CANADA
                                Attention: Phillip DeZwirek

          And if to the Holder, to the address or facsimile number of Holder as
     set forth on the Company's records, or such other address as the Holder has
     provided to the Company by notice duly given, with a copy to Lawrence N.
     Rosen, Esq., Lawrence N. Rosen, P.A., 2925 Aventura Boulevard, Suite 308,
     Aventura, Florida 33180.

          13.4 Notice of a Sale Transaction. The Company shall give all Holders
               ----------------------------
     of Notes notice of the Closing of a Sale Transaction at least thirty (30)
     days prior to such Closing.

          13.5 Collection. If the indebtedness represented by the Note or any
               ----------
     part thereof is collected at law or in equity or in bankruptcy,
     receivership or other judicial proceedings or if the Note is placed in the
     hands of attorneys for collection after the occurrence of an Event of
     Default, the Company agrees to pay, in addition to the outstanding
     principal and accrued interest payable hereon, reasonable attorneys' fees
     and costs incurred by the Holder, or on behalf of the Holder by a
     representative of the Holder.

          13.6 Successors and Assigns. The rights and obligations of the Company
               ----------------------
     and the Holder shall be binding upon and benefit the successors, assigns,
     heirs, administrators and transferees of the parties.

          13.7 Waivers. The Company and any endorsers, sureties, guarantors, and
               -------
     all others who are, or may become liable for the payment hereof severally:
     (a) waive presentment for payment, demand, notice of demand, notice of
     nonpayment or dishonor, protest and notice of protest of this Note, and all
     other notices in connection with the delivery, acceptance, performance,
     default, or enforcement of the payment of this Note, (b) consent to all
     extensions of time, renewals, postponements of time of payment of this Note
     or other modifications hereof from time to time prior to or after the
     maturity date hereof, whether by acceleration or in due course, without
     notice, consent or consideration to any of the foregoing, (c) agree to any
     substitution, exchange, addition, or release of any of the security for the
     indebtedness evidenced by this Note or the addition or release of any party
     or person primarily or secondarily liable hereon, (d) agree that Holder
     shall not be required first to institute any suit, or to exhaust its
     remedies against the Company or any other person or party to become liable
     hereunder or against the security in order to enforce the payment of this
     Note and (e) agree that, notwithstanding the occurrence of any of the
     foregoing (except by the express written release by Holder of any such
     person), the Company shall be and remain, directly and primarily liable for
     all sums due under this Note.

          13.8 Time. Time is of the essence in this Note.
               ----

                                       7

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          13.9 Captions. The captions of sections of this Note are for
               --------
     convenient reference only, and shall not affect the construction or
     interpretation of any of the terms and provisions set forth in this Note.

          13.10 Number and Gender. Whenever used in this Note, the singular
                -----------------
     number shall include the plural, and the masculine shall include the
     feminine and the neuter, and vice versa.

          13.11 Remedies. All remedies of the Holder shall be cumulative and
                --------
     concurrent and may be pursued singly, successively, or together at the sole
     discretion of the Holder and may be exercised as often as occasion therefor
     shall arise. No act of omission or commission of the Holder, including
     specifically any failure to exercise any right, remedy or recourse shall be
     effective unless it is set forth in a written document executed by the
     Holder and then only to the extent specifically recited therein. A waiver
     or release with reference to one event shall not be construed as continuing
     as a bar to or as a waiver or release of any subsequent right, remedy, or
     recourse as to any subsequent event.

          13.12 No Waiver by Holder. The acceptance by Holder of any payment
                -------------------
     under this Note which is less than the amount then due or the acceptance of
     any amount after the due date thereof, shall not be deemed a waiver of any
     right or remedy available to Holder nor nullify the prior exercise of any
     such right or remedy by Holder. None of the terms or provisions of this
     Promissory Note may be waived, altered, modified or amended except by a
     written document executed by Holder and then only to the extent
     specifically recited therein. No course of dealing or conduct shall be
     effective waive, alter, modify or amend any of the terms or provisions
     hereof. The failure or delay to exercise any right or remedy available to
     Holder shall not constitute a waiver of the right of the Holder to exercise
     the same or any other right or remedy available to Holder at that time or
     at any subsequent time.

          13.13 Submission to Jurisdiction. BORROWER, AND ANY ENDORSERS,
                --------------------------
     SURETIES, GUARANTORS AND ALL OTHERS WHO ARE, OR WHO MAY BECOME, LIABLE FOR
     THE PAYMENT HEREOF SEVERALLY, IRREVOCABLY AND UNCONDITIONALLY (A) AGREE
     THAT ANY SUIT, ACTION, OR OTHER LEGAL PROCEEDING ARISING OUT OF OR RELATING
     TO THIS NOTE OR ANY OTHER AGREEMENT, DOCUMENT OR INSTRUMENT DELIVERED
     PURSUANT TO, OR IN CONNECTION WITH THIS NOTE SHALL BE BROUGHT AND
     MAINTAINED IN THE COURTS IN AND FOR NEW YORK COUNTY, NEW YORK, OR IN THE
     UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW YORK; (B)
     CONSENT TO THE JURISDICTION OF EACH SUCH COURT IN ANY SUCH SUIT, ACTION OR
     PROCEEDING; AND (C) WAIVE ANY OBJECTION WHICH IT OR THEY MAY HAVE TO THE
     LAYING OF VENUE OF ANY SUCH SUIT, ACTION, OR PROCEEDING IN ANY OF SUCH
     COURTS.

          13.14 Waiver of Trial by Jury. HOLDER AND BORROWER HEREBY KNOWINGLY,
                -----------------------
     IRREVOCABLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHT EITHER MAY HAVE
     TO A TRIAL BY JURY IN RESPECT OF ANY ACTION, PROCEEDING OR COUNTERCLAIM
     BASED ON THIS NOTE, OR

                                       8

<PAGE>

     ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS NOTE OR ANY OTHER DOCUMENT
     EXECUTED IN CONNECTION THEREWITH, OR ANY COURSE OF CONDUCT, COURSE OF
     DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY PARTY
     HERETO. THIS PROVISION IS A MATERIAL INDUCEMENT FOR HOLDER TO MAKE THE LOAN
     EVIDENCED BY THIS NOTE.

          3.15 This Note is issued, in part, in replacement of the Prior Note.
     The indebtedness evidenced by the Prior Note has not been paid; instead
     this Note is issued in substitution for the Prior Note and the unpaid
     indebtedness evidenced thereby continues to be outstanding and is intended
     to be evidenced hereby.

                                        CECO ENVIRONMENTAL CORP.

                                        By:         /s/  Phillip DeZwirek
                                                 -------------------------------
                                                 Phillip DeZwirek, President

                                       9<PAGE>

                                                                   Exhibit 10.42

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

     This FOURTH AMENDMENT TO CREDIT AGREEMENT (this "Amendment") is made as of
the 20th day of August, 2001 by and among CECO GROUP, INC., CECO FILTERS,

INC., AIR PURATOR CORPORATION, NEW BUSCH CO., INC., THE KIRK & BLUM
MANUFACTURING COMPANY, KBD/TECHNIC, INC. and CECO ABATEMENT SYSTEMS, INC. (the
"Borrowers"), and PNC BANK, NATIONAL ASSOCIATION ("PNC"), individually and as
agent for itself and the other banks (collectively, the "Banks") which from time
to time are parties to the hereinafter defined Credit Agreement (in such
capacity, the "Agent").

                                   BACKGROUND
                                   ----------

     A. The Agent, the Banks and the Borrowers are parties to a Credit Agreement
dated as of December 7, 1999 as amended by Amendment to Credit Agreement, dated
as of March 28, 2000, by Second Amendment to Credit Agreement dated as of
November 10, 2000 and by Third Amendment to Credit Agreement dated as of March
30, 2001 (as amended, the "Credit Agreement").

     B. The Borrowers have requested and the Agent and the Banks have agreed to
amend the Credit Agreement on the terms and conditions set forth herein.

     NOW, THEREFORE, in consideration of the foregoing and for good and valuable
consideration, the legality and sufficiency of which is hereby acknowledged, the
parties hereto, intending to be legally bound hereby, agree as follows:

     1. Definitions. Capitalized terms used herein and not otherwise defined
        -----------
herein shall have the meanings assigned to them in the Credit Agreement.

     2. Amendments to Credit Agreement. The Credit Agreement is hereby amended
        ------------------------------
as follows:

          (a) The definition of "Revolving Credit Commitment" as presently set
forth in Section 1.1 of the Credit Agreement shall be deleted and shall be
replaced with the following:

          "Revolving Credit Commitment": means $8,000,000, as reduced from time
           ---------------------------
          to time pursuant to Section 2.9.

          (b) The definition of "Termination Date" as presently set forth in
Section 1.1 of the Credit Agreement shall be deleted and shall be replaced with
the following:

          "Termination Date": April 1, 2003
           ----------------

                                       1

<PAGE>

          (c) Annex I to the Credit Agreement shall be deleted and shall be
replaced with the following:

---------------------------------------------------------------------------
     Loans              Applicable Margin for         Applicable Margin for
                           Eurodollar Loans              Base Rate Loans
---------------------------------------------------------------------------
Revolving Loans                 4.50%                         3.00%
---------------------------------------------------------------------------
  Term Loan A                   4.50%                         3.00%
---------------------------------------------------------------------------
  Term Loan B                   5.00%                         3.50%
---------------------------------------------------------------------------

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

          (d) The provisions of paragraph 2(k) of the Third Amendment to Credit
Agreement, which modifies Section 2.6(b) of the Credit Agreement, is hereby
modified by adding the following at the end of paragraph 2(k):

          and such additional amounts, up to $4,000,000 (not including the
          $1,000,000), (i) that the Borrowers or Guarantors receive as net
          proceeds of the Equity Contribution and (ii) any amounts in excess of
          $6,500,000 EBITDA for the twelve months ending December 31, 2001, also
          will be used as a prepayment of the Term Loans. The sum total of the
          $1,000,000 prepayment and the aforementioned items (i) and (ii) will
          not exceed $5,000,000.

          (e) Section 2.10 of the Credit Agreement shall be modified by adding
the following at the end thereof.

          (g) Life Insurance. No later than September 30, 2001, Borrowers shall
              --------------
          obtain the maximum amount of the cash value of the Life Insurance as
          will not cause the Life Insurance policy to be canceled or create
          substantial adverse income tax consequences for Borrowers and shall
          pay to Agent, for the ratable benefit of the Banks, an amount equal to
          the cash value of the Life Insurance so obtained as a prepayment of
          the principal of the Term Loan B. Such payment shall be applied in the
          inverse order of maturity. Borrowers shall disclose to the Banks, in
          detail reasonably acceptable to the Banks, any substantial adverse
          income tax consequences to Borrowers which reduce the amount of cash
          value taken from the Life Insurance and paid to the Agent.

          (f) Section 5.2 of the Credit Agreement is hereby amended by inserting
the following new subsection (g):

               (g) Beginning on Monday of the second week after the week in
               which the Fourth Amendment to Credit Agreement is dated and
               continuing on Monday of each week thereafter, for the balance of
               the term of the Credit Agreement, rolling twelve (12) week,
               weekly cash flow projections for the Borrowers, for the weeks
               which begin with the Monday of the week following the date each
               such projection is due. Beginning with the second such projection
               which is due, and continuing on each Monday thereafter, for the
               balance of the term of the Credit Agreement, a comparison of
               actual cash

                                       2

<PAGE>

               flow of the Borrowers to projected cash flow of the Borrowers for
               the week which ended on the Friday of the week before such
               comparison is due. The projections and comparisons shall all be
               in form and content reasonably acceptable to the Banks.
               Notwithstanding any provision to the contrary contained in this
               Agreement, the Borrowers' failure to deliver any of the items
               required by this subsection (g) subject to a cure period of three
               (3) business days after the required notice, shall constitute an
               Event of Default.

          (g) Section 5.6 of the Credit Agreement is hereby amended by inserting
the following new subsection (d):

               (d) Provide to the Banks, on or before August 31, 2001, a list of
               the equipment of Borrowers which includes the following
               information: (i) the location of each piece of equipment; (ii)
               the serial number of each piece of equipment which has a serial
               number; (iii) a description of each piece of equipment; and (iv)
               the date each piece of equipment was placed in service by one of
               the Borrowers, to the extent known; thereafter, permit appraisers
               selected as provided below access to the Borrowers property, as
               the appraisers deem reasonably necessary, to perform appraisals
               for the Banks; and pay the reasonable costs of such appraisals.
               The Banks will attempt to minimize the costs of the equipment
               appraisals to the extent reasonably possible without defeating
               the Banks' purpose for obtaining such equipment appraisals. The
               Banks will obtain bids from not less than four (4) real estate
               appraisers to appraise all of the Borrowers' real estate except
               for the Conshohocken, Pennsylvania property. The Banks will
               provide the Borrowers with summaries of all of such bids. The
               Banks shall engage the lowest acceptable bidder chosen by the
               Banks. All appraisals hereunder shall be in form and content
               reasonably acceptable to the Banks.

          (h) The provision of paragraph 2(m) of the Third Amendment to Credit
Agreement, which modifies Section 6.1(a) Leverage Ratio of the Credit Agreement,
                                         --------------
is hereby modified as follows:

          (m) Section 6.1(a) Leverage Ratio of the Credit Agreement shall be
                             --------------
     abated as it presently exists through January 1, 2002 and shall be modified
     as follows:

          (a) Leverage Ratio. Permit the Leverage Ratio, as of the end of any
              --------------
          fiscal quarter ending during the period specified below, for the prior
          four consecutive fiscal quarters, to equal or exceed the amount set
          forth opposite such period:

                                       3

<PAGE>

-----------------------------------------------------------------------------
                                                   Leverage Ratio Must Not Be
Last Day of Fiscal Quarter During Period                  Greater Than
-----------------------------------------------------------------------------
December 31, 2000 through March 30, 2001                   5.50 to 1
-----------------------------------------------------------------------------
March 31, 2001 through June 29, 2001                       6.30 to 1
-----------------------------------------------------------------------------
June 30, 2001 through September 29, 2001                   6.70 to 1
-----------------------------------------------------------------------------
September 30, 2001 through December 30, 2001               5.50 to 1
-----------------------------------------------------------------------------
December 31, 2001                                          3.10 to 1
-----------------------------------------------------------------------------

          provided, however, the abatement of Section 6.1(a) Leverage Ratio of
                                                             --------------
          the Credit Agreement shall cease and such section shall continue as
          provided in the Credit Agreement immediately before the effective date
          of this Amendment on January 2, 2002.

          (i) The provision of paragraph 2(n) of the Third Amendment to Credit
Agreement, which modifies Section 6.1(b) Fixed Charge Coverage Ratio of the
                                         ---------------------------
Credit Agreement, is hereby modified as follows

          (n) Section 6.1(b) of the Credit Agreement shall be abated in its
entirety as it presently exists through January 1, 2002 and shall be modified as
follows:

          (b) Fixed Charge Coverage Ratio. Permit the Fixed Charge Coverage
              ---------------------------
          Ratio, as of the end of each fiscal quarter ending during the period
          specified below, to be less than the amount set forth opposite such
          period:

--------------------------------------------------------------------------------
                                                 Fixed Charge Ratio Must Not Be
Last Day of Fiscal Quarter During Period                   Less Than
--------------------------------------------------------------------------------
December 31, 2000 through March 30, 2001                    .84 to 1
--------------------------------------------------------------------------------
March 31, 2001 through June 29, 2001                        .80 to 1
--------------------------------------------------------------------------------
June 30, 2001 through September 29, 2001                    .76 to 1
--------------------------------------------------------------------------------
September 30, 2001 through December 30, 2001                .80 to 1
--------------------------------------------------------------------------------
December 31, 2001                                          1.00 to 1
--------------------------------------------------------------------------------

          provided, however, that the calculation of Fixed Charge Coverage Ratio
          for September 30, 2001, shall be calculated on the basis of calendar
          year 2001 to date, rather than on a rolling twelve month basis, and
          further provided, however, that the abatement of Section 6.1(b) Fixed
                                                                          -----
          Charge Coverage Ratio of the Credit Agreement shall cease and such
          ---------------------
          section shall continue as provided in the Credit Agreement immediately
          before the effective date of this Amendment on January 2, 2002.

          (j) The provision in paragraph 2(o) of the Third Amendment to Credit
Agreement, which modifies Section 6.1(c) Interest Coverage Ratio of the Credit
                                         -----------------------
Agreement, is hereby modified as follows:

                                       4

<PAGE>

          (o) Section 6.1(c) Interest Coverage Ratio of the Credit Agreement
                             -----------------------
shall be abated in its entirety as it presently exists through January 1, 2002
and shall be modified as follows:

          (c) Interest Coverage Ratio. Permit the Interest Coverage Ratio, as of
              -----------------------
          the end of each fiscal quarter ending during the period specified
          below, to be less than the amount set forth opposite such period:

--------------------------------------------------------------------------------
                                                   Interest Coverage Ratio Must
Last Day of Fiscal Quarter During Period                 Not Be Less Than
--------------------------------------------------------------------------------
December 31, 2000 through March 30, 2001                    1.40 to 1
--------------------------------------------------------------------------------
March 31, 2001 through June 29, 2001                        1.10 to 1
--------------------------------------------------------------------------------
June 30, 2001 through September 29, 2001                     1.00 to 1
--------------------------------------------------------------------------------
September 30, 2001 through December 30, 2001                1.25 to 1
--------------------------------------------------------------------------------
December 31, 2001                                           2.20 to 1
--------------------------------------------------------------------------------

          provided, however, that Interest Coverage Ratio for September 30,
          2001, shall be calculated on the basis of calendar year 2001 to date,
          rather than a rolling twelve month basis, and further provided,
          however, the abatement of Section 6.1(c) Interest Coverage Ratio of
                                                   -----------------------
          the Credit Agreement shall cease on January 2, 2002, and such section
          shall continue as provided in the Credit Agreement immediately before
          the effective date of this Amendment, except that the words "equal or
          exceed" in the fifth line of Section 6.1(c) shall be changed to "be
          less than".

          (k) Beginning on the date of the Fourth Amendment to Credit Agreement,
for the balance of the term of the Credit Agreement, the "Interest Period" with
respect to all Eurodollar Loans and conversions to Eurodollar Loans shall be for
a one month period and no Eurodollar Loan with a period of more than one month
which exists on the date of the Fourth Amendment to Credit Agreement may be
continued for a period of more than one month and requests by Borrowers for
borrowings, conversions or continuations of Eurodollar Loans for periods of more
than one month shall be treated as requests for borrowings, conversions or
continuations of Eurodollar Loans for a period of one month.

     3. Additional Covenants. The Credit Agreement and any other Applicable Loan
        --------------------
Document shall be amended to include the following additional covenants and the
Borrowers' failure to comply with such additional covenants shall constitute an
immediate Event of Default without any required notice or cure period,
notwithstanding any provision to the contrary contained in the Credit Agreement
or any other Loan Document:

          (a) Borrowers hereby represent to the Banks that their operations
located in Chicago, Illinois, will be performed by CECO Abatement Systems, Inc.,
a Delaware corporation which was formed on April 26, 2001, and which is wholly
owned Subsidiary of one of Borrowers. By executing this Fourth Amendment to
Credit Agreement, CECO Abatement Systems, Inc. agrees: (i) to become one of the
Borrowers under the Credit Agreement, as if it had originally executed the
Credit Agreement and the other Loan Documents; (ii) to be bound by the terms of
the Credit Agreement and the other Loan Documents; (iii) to complete the due
diligence worksheets provided

                                       5

<PAGE>

by the Banks within fifteen (15) days after provided by the Banks; (iv) to keep
all of its assets free and clear of all liens and security interests except for
the liens and security interests given for the benefit of the Banks and
permitted liens under Section 6.3 of the Credit Agreement; and (v) within
fifteen (15) days after provided to it by the Banks, execute and deliver all
such mortgages, deeds of trust, security agreements, pledges, financing
statements and other collateral security documents as the Banks shall request,
from time to time.

          (b) Upon request by the Banks, the Borrowers, and each of them, shall
execute and deliver any documents required by the Banks to perfect their liens
and security interests under the Credit Agreement and the other Loan Documents,
including, but not limited to, real estate mortgages or deeds of trust and
security agreements and financing statements under the Uniform Commercial Code.

     4. Amendment Fees. The Borrowers shall pay to the Agent, for the ratable
        --------------
benefit of the Banks, upon the date of this Amendment, a fee of twenty-five
thousand dollars ($25,000). In addition, the provisions of paragraphs 4 and 5 of
the Third Amendment to Credit Agreement for the payment of the one hundred fifty
thousand dollar ($150,000) Amendment Fee are amended to provide that: (i) on the
date of this Amendment, the amount of fifty thousand dollars ($50,000) currently
in the Cash Collateral Account at Fifth Third Bank shall be paid to Agent, for
the ratable benefit of the Banks; and (ii) immediately upon payment by the
Borrowers of the fifty thousand dollars ($50,000) deposits, if any, required to
be made to the Cash Collateral Account at Fifth Third Bank on (A) the earlier of
(i) the date of the Equity Contribution or (ii)September 30, 2001, and (B) if
the Equity Contribution was not made prior to September 30, 2001, the earlier of
(i) the date of the Equity Contribution or (ii) December 31, 2001, as provided
in paragraph 5 of the Third Amendment to Credit Agreement, those deposits shall
be paid to Agent, for the ratable benefit of the Banks. Such deposits and
payments shall satisfy all payments due under paragraph 4 of the Credit
Agreement. In all other respects the provisions of paragraphs 4 and 5 of the
Third Amendment to Credit Agreement shall remain in effect.

     5. Amendment to the Loan Documents. All references to the Credit Agreement
        -------------------------------
in the Loan Documents and in any documents executed in connection therewith
shall be deemed to refer to the Credit Agreement as amended by this Amendment.

     6. Ratification of the Loan Documents. Notwithstanding anything to the
        ----------------------------------
contrary herein contained or any claims of the parties to the contrary, the
Agent, the Banks and the Borrowers agree that the Loan Documents and each of the
documents executed in connection therewith are in full force and effect and each
such document shall remain in full force and effect, as further amended by this
Amendment, and each of the Borrowers hereby ratifies and confirms its
obligations thereunder.

     7. Representations and Warranties.
        ------------------------------

          (a) Each Borrower hereby certifies that (i) the representations and
warranties of such Borrower in the Credit Agreement as amended herein are true
and correct in all material respects as of the date hereof, as if made on the
date hereof, provided that, for purposes of this Amendment, only: (x) the
representations and warranties made in Section 3.1(a) and (b) and 3.21

                                       6

<PAGE>

of the Credit Agreement shall relate to the most recent financial statements of
the type referred to therein which have been given by the Borrowers to the Banks
(but the foregoing shall not be a waiver of any Default or Event of Default
based on any representation or warranty made by the Borrowers in the Credit
Agreement or any amendment thereof, prior to this Amendment, being untrue at the
time made, or for any breach of any covenant contained in the Credit Agreement,
as amended prior to the date of this Amendment); (y) the representations and
warranties made in Section 3.1(c) of the Credit Agreement shall be made as of
the date of this Amendment and not as of the Closing Date; and (z) the
representations and warranties made in Section 3.2 of the Credit Agreement shall
refer to Material Adverse Effect since the last audited consolidated financial
statements of the Borrowers provided to the Banks by the Borrowers, instead of
since September 30, 1999 (but the foregoing shall not be a waiver of any Default
or Event of Default based on any representation or warranty made by the
Borrowers in the Credit Agreement or any amendment thereof, prior to this
Amendment, being untrue at the time made, or for any breach of any covenant
contained in the Credit Agreement, as amended prior to the date of this
Amendment); and (ii) no Event of Default and no event which could become an
Event of Default with the passage of time or the giving of notice, or both,
under the Credit Agreement or the other Loan Documents exists on the effective
date hereof.

          (b) Each Borrower further represents that it has all the requisite
power and authority to enter into and to perform its obligations under this
Amendment, and that the execution, delivery and performance of this Amendment
have been duly authorized by all requisite action and will not violate or
constitute a default under any provision of any applicable law, rule,
regulation, order, writ, judgment, injunction, decree, determination or award
presently in effect or of the Articles of Incorporation or by-laws of such
Borrower, or of any indenture, note, loan or credit agreement, license or any
other agreement, lease or instrument to which such Borrower is a party or by
which such Borrower or any of its properties are bound.

          (c) Each Borrower also further represents that its obligation to repay
the Loans, together with all interest accrued thereon, is absolute and
unconditional, and there exists no right of set off or recoupment, counterclaim
or defense of any nature whatsoever to payment of the Loans, and each Borrower
further represents that the Agents and Banks have fully performed all of their
respective obligations under the Loan Documents through the date of this
Amendment..

          (d) Each Borrower also further represents that there have been no
changes to the Articles of Incorporation, by-laws or other organizational
documents of each such Borrower since the most recent date true and correct
copies thereof were delivered to the Agent.

     8. Conditions Precedent. The effectiveness of the amendments set forth
        --------------------
herein is subject to the fulfillment, to the satisfaction of the Agent and its
counsel, of the following conditions precedent:

          (a) The Borrowers shall have delivered to the Agent the following, all
of which shall be in form and substance satisfactory to the Agent and shall be
duly completed and executed:

               (i) This Amendment and the consent of the Guarantor and the
          consent of Green Diamond Oil Corp. as attached hereto; and

                                       7

<PAGE>

               (ii) Such additional documents, certificates and information as
          the Agent may require pursuant to the terms hereof or otherwise
          reasonably request.

          (b) After giving effect to the amendments contained herein, the
representations and warranties set forth in the Credit Agreement shall be true
and correct on and as of the date hereof.

          (c) After giving effect to the amendments contained herein, no Event
of Default hereunder, and no event which, with the passage of time or the giving
of notice, or both, would become such an Event of Default shall have occurred
and be continuing as of the date hereof.

          (d) The Borrowers shall have paid the reasonable fees and
disbursements of the Agent's counsel incurred in connection with this Amendment.

     9. No Waiver. Except as expressly provided herein, this Amendment does not
        ---------
and shall not be deemed to constitute a waiver by the Agent or the Banks of any
Event of Default, or of any event which with the passage of time or the giving
of notice or both would constitute an Event of Default, nor does it obligate the
Agent or the Banks to agree to any further modifications to the Credit Agreement
or any other Loan Document or constitute a waiver of any of the Agent's or the
Banks' other rights or remedies.

     10. Waiver and Release. The Borrowers each on behalf of themselves, their
         ------------------
agents, employees, officers, directors, successors and assigns, do hereby waive
and release Agent and Banks, their agents, employees, officers, directors,
affiliates, parents, successors and assigns, from any claims arising from or
related to administration of the Credit Agreement and Loan Document and any
course of dealing among the parties not in compliance with those agreements from
the inception of the Credit Agreement whether known or unknown through the date
of execution and delivery of this Amendment.

     11. Effective Date. The parties hereto agree that subsections (h), (i) and
         --------------
(j) of Section 2 hereof shall for all purposes be deemed to be effective as of
June 30, 2001 and for all purposes the Credit Agreement shall be deemed to have
been amended as of such date to reflect the amendments to the Credit Agreement
set forth in such subsections.

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of
                         the day and year first above written.

                                          CECO GROUP, INC.

                                          By:         /s/  Richard J. Blum
                                                   -----------------------------
                                          Name:    Richard J. Blum
                                          Title:   CEO & President

                                       8

<PAGE>

                                          CECO FILTERS, INC.

                                          By:        /s/  Marshall J. Morris
                                                   -----------------------------
                                          Name:    Marshall J. Morris
                                          Title:   Treasurer

                                          AIR PURATOR CORPORATION

                                          By:        /s/  Marshall J. Morris
                                                   -----------------------------
                                          Name:    Marshall J. Morris
                                          Title:   Treasurer

                                          NEW BUSCH CO., INC.

                                          By:        /s/  Richard J. Blum
                                                   -----------------------------
                                          Name:    Richard J. Blum
                                          Title:   Treasurer

                                          THE KIRK & BLUM MANUFACTURING COMPANY

                                          By:        /s/  Richard J. Blum
                                                   -----------------------------
                                          Name:    Richard J. Blum
                                          Title:   President

                                          KBD/TECHNIC, INC.

                                          By:        /s/  Marshall J. Morris
                                                   -----------------------------
                                          Name:    Marshall Morris
                                          Title:   Treasurer

                                          CECO ABATEMENT SYSTEMS, INC.

                                          By:        /s/  David D. Blum
                                                   -----------------------------
                                          Name:    David D. Blum
                                          Title:   President

                                       9

<PAGE>

                                          PNC BANK, NATIONAL ASSOCIATION, as
                                          Agent and as a Bank

                                          By:        /s/  William c. Miles
                                                   -----------------------------
                                          Name:    William C. Miles
                                          Title:   Vice President

                                          FIFTH THIRD BANK, as a Bank

                                          By:        /s/  David R. Alexander
                                                   -----------------------------
                                          Name:    David R. Alexander
                                          Title:   Assistant Vice President

                                          BANK ONE, NA, as a Bank

                                          By:        /s/  Jeffrey C. Nicholson
                                                   -----------------------------
                                          Name:    Jeffrey C. Nicholson
                                          Title:   Vice President

                                       10

<PAGE>

                            GUARANTOR'S CONSENT

     By Corporate Guaranty, dated December 7, 2000 (the "Guaranty"), the
undersigned (the "Guarantor") guaranteed to the Agent and the Banks, subject to
the terms and conditions set forth therein, the prompt payment and performance
of all of the Obligations (as defined therein). The Guarantor consents to the
Borrowers' execution of the foregoing Fourth Amendment to Credit Agreement. The
Guarantor hereby acknowledges and agrees that the Guaranty remains unaltered and
in full force and effect and is hereby ratified and confirmed in all respects.

                                          CECO ENVIRONMENTAL CORP.

                                          By:        /s/  Richard J. Blum
                                                   -----------------------------
                                          Name:    Richard J. Blum
                                          Title:   President

                                       11

<PAGE>

                         SUBORDINATED CREDITOR'S CONSENT

         The undersigned (the "Subordinated Creditor") is a party to the
Subordination Agreement with the Agent and the Banks and other subordinated
creditors, dated December 7, 2000 (the "Subordination Agreement"). The
Subordinated Creditor consents to the Borrowers' execution of the foregoing
Fourth Amendment to Credit Agreement. The Subordinated Creditor hereby
acknowledges and agrees that the Subordination Agreement remains unaltered
and in full force and effect and is hereby ratified and confirmed in all
respects.

                                          GREEN DIAMOND OIL CORP.

                                          By:        /s/  Phillip DeZwirek
                                                   -----------------------------
                                          Name:    Phillip DeZwirek
                                          Title    President

                                       12

<PAGE>

                         SUBORDINATED CREDITOR'S CONSENT

     The undersigned (the "Subordinated Creditor") is a party to the
Subordination Agreement with the Agent and the Banks and other subordinated
creditors, dated December 7, 2000 (the "Subordination Agreement"). The
Subordinated Creditor consents to the Borrowers' execution of the foregoing
Fourth Amendment to Credit Agreement. The Subordinated Creditor hereby
acknowledges and agrees that the Subordination Agreement remains unaltered and
in full force and effect and is hereby ratified and confirmed in all respects.

                                          ICS TRUSTEE SERVICES, LTD.

                                          By:
                                             -----------------------------------
                                          Name:
                                          Title

                                       13

<PAGE>

                         SUBORDINATED CREDITOR'S CONSENT

     The undersigned (the "Subordinated Creditor") is a party to the
Subordination Agreement with the Agent and the Banks and other subordinated
creditors, dated December 7, 2000 (the "Subordination Agreement"). The
Subordinated Creditor consents to the Borrowers' execution of the foregoing
Fourth Amendment to Credit Agreement. The Subordinated Creditor hereby
acknowledges and agrees that the Subordination Agreement remains unaltered and
in full force and effect and is hereby ratified and confirmed in all respects.

                                                  HARVEY SANDLER

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

                                       14

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