Document:

<PAGE>

                                                                     Exhibit 4.1

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

                                SECOND AMENDMENT

                                       TO

                             NOTE PURCHASE AGREEMENT

                                  by and among

                             NUMATICS, INCORPORATED,

                                 NUMATICS, GMBH,

                                 NUMATICS LTD.,

                    THE OTHER LOAN PARTIES SIGNATORY HERETO,

                                       and

                   AMERICAN CAPITAL FINANCIAL SERVICES, INC.,
                                    AS AGENT

                                       and

                          THE PURCHASERS IDENTIFIED ON
                                     ANNEX A

                    Date of Second Amendment: August 13, 2002
                        Original Date: November 28, 2001

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

<PAGE>

                                SECOND AMENDMENT
                                       TO
                             NOTE PURCHASE AGREEMENT

                    $14,354,000 Aggregate Principal Amount of
                       Senior Notes Due November 27, 2006
                    of Numatics, Incorporated, Numatics, GMBH
                                and Numatics Ltd.

                    $17,000,000 Aggregate Principal Amount of
                         Senior Secured Term A Notes Due
                                November 27, 2006
                            of Numatics, Incorporated

     THIS SECOND AMENDMENT TO NOTE PURCHASE AGREEMENT (this "Amendment") is
entered into as of August 13, 2002 by and NUMATICS, INCORPORATED, a Michigan
corporation (the "Company"), NUMATICS, GMBH, a corporation organized under the
laws of the Federal Republic of Germany ("Numatics Germany"), NUMATICS LTD., a
Canadian corporation ("Numatics Canada", and together with the Company and
Numatics Germany, the "Borrowers"), the U.S. Subsidiaries of the Company
signatory hereto (the "Subsidiary Guarantors" and together with the Borrowers,
the "Loan Parties"), the securities purchasers that are now and hereafter at any
time parties hereto and are listed in Annex A (or any amendment or supplement
thereto) (each a "Purchaser" and collectively, "Purchasers"), and AMERICAN
CAPITAL FINANCIAL SERVICES, INC., a Delaware corporation ("ACFS"), as
administrative agent for Purchasers (in such capacity "Agent").

                                    RECITALS

     A.   As of November 28, 2001, the Loan Parties, the Purchasers and Agent
          entered into a Note Purchase Agreement as amended by that First
          Amendment thereto dated as of March 29, 2002 (the "Agreement"),
          pursuant to which the Purchasers purchased from the Borrowers certain
          notes (the "Notes"). Capitalized terms used and not defined elsewhere
          in this Amendment that are defined in the Agreement shall have the
          same meaning as in the Agreement.

     B.   The Loan Parties are in default of the financial covenants set forth
          in Section 7.3 of the Agreement for the period ended June 30, 2002
          (the "Existing Defaults").

     C.   The Loan Parties have requested that Purchaser waive the Existing
          Defaults and amend certain provisions of the Agreement, and Purchaser
          is willing to do so on the terms and conditions set forth herein.

Second Amendment to Note Purchase Agreement

                                       1

<PAGE>

     NOW, THEREFORE, the parties hereto, in consideration of the premises and
their mutual covenants and agreements herein set forth and intending to be
legally bound hereby, covenant and agree as follows:

                                    ARTICLE 1
                                  THE AMENDMENT

     Upon the satisfaction of the conditions set forth in Section 3.1
herein, the Agreement shall be deemed to be amended, retroactive to November 28,
2001, as set forth in this Article 1.

     1.1 Amendment to Section 7.3. Section 7.3 of the Agreement is amended and
restated in its entirety to read as follows:

          7.3 Financial Covenants. The Loan Parties, jointly and severally,
     covenant that, so long as all or any part of the principal amount of the
     Notes or any interest thereon shall remain outstanding, they shall maintain
     the following financial covenants on a consolidated basis at the end of
     each calendar quarter (except that for the first calendar quarter of 2003
     financial covenants shall be measured at the end of each calendar month and
     such compliance shall be evidenced by a compliance certificate in the form
     of Exhibit F to be delivered within twenty (20) days following such
     calendar month) (each such date being a "Measurement Date").

               (a) Minimum Tangible Net Worth. A minimum Tangible Net Worth of
          (i) $15,700,000 at all times from and including November 28, 2001
          through December 31, 2002, (ii) $19,500,000 at all times from and
          including January 1, 2003 through December 30, 2003, and (iii)
          $22,000,000 at all times from and including December 31, 2003 and
          thereafter.

               (b) Minimum Debt Service Coverage Ratio. A minimum Debt Service
          Coverage ratio for any twelve (12) consecutive months ending as of the
          Measurement Date as follows:

Second Amendment to Note Purchase Agreement

                                       2

<PAGE>

                 Measurement Date                 Ratio
                 ----------------                 -----

                 From Closing Date through        1.00 to 1.0
                 December 31, 2001
                 From January 1, 2002 through     1.05 to 1.0
                 March 31, 2002
                 From April 1, 2002 through       1.00 to 1.0
                 September 30, 2002
                 From October 1, 2002 through     1.05 to 1.0
                 December 31, 2002
                 From January 1, 2003 and
                 thereafter                       1.10 to 1.0

               (c) Interest Coverage Ratio. A maximum ratio (i) Adjusted Net
          Income to (ii) scheduled payments of interest and fees, to the extent
          carried as interest expense on the Company's and its Subsidiaries'
          consolidated financial statements, with respect to indebtedness for
          borrowed money (including the interest component payments with respect
          to Capitalized Leases) for any period of twelve (12) consecutive
          months ending as of the Measurement Date as follows:

                 Measurement Date                 Ratio
                 ----------------                 -----

                 From Closing Date through        1.20 to 1.0
                 March 31, 2002
                 From April 1, 2002 through       1.15 to 1.0
                 June 30, 2002
                 From July 1, 2002 through        1.10 to 1.0
                 September 30, 2002
                 From October 1, 2002 through     1.20 to 1.0
                 December 31, 2002
                 From January 1, 2003 and
                 thereafter                       1.35 to 1.0

                                    ARTICLE 2
                                 LIMITED WAIVER

     2.1 Waiver. Upon the Loan Parties' compliance with the terms and conditions
in Article III hereof, Purchaser hereby waives the Existing Defaults for the
quarter ended June 30, 2002.

     2.2 Limitation of Waiver. Except as specifically provided in this Article
II, nothing contained in this Amendment shall be construed as a waiver by
Purchaser of any

Second Amendment to Note Purchase Agreement

                                       3

<PAGE>

covenant or provision of the Agreement, the other Purchase Documents, this
Amendment, or of any other contract or instrument between the Loan Parties
and/or Purchaser, and the failure of Purchaser at any time or times hereafter to
require strict performance by the Loan Parties of any provision thereof shall
not waive, affect or diminish any right of Purchaser to thereafter demand strict
compliance therewith. Purchaser hereby reserves all rights granted under the
Agreement, the other Purchase Documents, this Amendment and any other contract
or instrument between the Loan Parties and/or Purchaser.

                                    ARTICLE 3
                              CONDITIONS PRECEDENT

The obligation of Purchaser to deliver this Amendment is subject to the
satisfaction of the following conditions precedent:

     3.1 Accommodation Fee. The Loan Parties shall have paid to the Purchaser or
its designee an accommodation fee in the amount of $75,000.

     3.2 Field Audit Fee. The Loan Parties shall have paid to the Purchaser or
its designee a field audit fee in the amount of $25,000 in order for Purchaser
to conduct an audit of the Loan Parties Collateral.

     3.3 Revolving Credit Amendment. The Loan Parties shall have delivered an
amendment to the Revolving Credit Agreement, duly executed by the Loan Parties
and the Revolving Financing Lender, all to the satisfaction of Purchaser.

     3.4 Continuation of Representations and Warranties. All representations,
warranties, covenants and agreements of the Loan Parties contained in the
Agreement shall be true and correct in all material respects at and as of the
date hereof as though then made, except (i) to the extent of the changes caused
by the transactions expressly contemplated therein or herein, and (ii) for such
representations and warranties as by their terms expressly speak as of an
earlier date, and an officer of the Loan Parties shall have delivered a
certificate to Purchaser to such effect.

     3.5 Costs and Expenses. The Loan Parties shall have paid to the Purchaser
and Purchaser's counsel all outstanding costs and expenses related to
preparation, negotiation and delivery of this Amendment, any previous amendment
and the Agreement.

                                    ARTICLE 4
                    REFERENCE TO AND EFFECT ON THE AGREEMENT

     4.1 Representations. In order to induce the Purchaser to enter into this
Amendment and to consummate the transactions contemplated hereby, the Loan
Parties hereby (x) represent and warrant that no Default or Event of Default
exists on the date hereof after giving effect to this Amendment and (y) make
each of the representations, warranties and agreements contained in the
Agreement and the other Purchase Documents on and as of the date hereof, after
giving effect to this Amendment (it being

Second Amendment to Note Purchase Agreement

                                       4

<PAGE>

understood that any representation or warranty that by its terms is made as of a
specified date shall be required to be true and correct in all material respects
as of such date).

     4.2 References. On and after the date hereof, (i) each reference in the
Agreement to "this Agreement," "hereunder," "hereof," "herein," or words of like
import shall mean and be a reference to the Agreement as amended hereby, and
(ii) each reference to the Agreement in all other Purchase Documents shall mean
and be a reference to the Agreement, as amended hereby.

     4.3 Effects. Except as specifically amended hereby, the Agreement and all
other documents, instruments and agreements executed and/or delivered in
connection therewith, shall remain in full force and effect, and are hereby
ratified and confirmed.

     4.4 No Waiver or Novation. The execution, delivery and effectiveness of
this Amendment shall not (i) operate as a waiver of any right, power or remedy
of Purchaser, whether created by contract, at law or in equity, (ii) constitute
a waiver of, or consent to and departure from, any provision of the Agreement,
or any other documents, instruments and agreements executed and/or delivered in
connection therewith (the "Note Documents"), or (iii) be construed or deemed to
be a satisfaction, novation, cure, modification, amendment or release of the
Notes.

                                    ARTICLE 5
                                  MISCELLANEOUS

     5.1 Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICT
OF LAWS PRINCIPLES.

     5.2 Severability. Whenever possible, each provision of this Amendment shall
be interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Amendment is held to be prohibited by or invalid
under applicable law in any jurisdiction, such provision shall be ineffective
only to the extent of such prohibition or invalidity, without invalidating any
other provision of this Amendment.

     5.3 Headings. Article, section and subsection headings in this Amendment
are included for convenience of reference only and shall not constitute a part
of this Amendment for any other purpose.

     5.4 Counterparts. This Amendment may be executed in any number of
counterparts and by either party hereto on separate counterparts, each of which,
when so executed and delivered, shall be an original, but all such counterparts
shall together constitute one and the same instrument.

     5.5 Integration. This Amendment, the Agreement and the other Purchase
Documents set forth the entire understanding of the parties hereto with respect
to all matters contemplated hereby and supersede all previous agreements and
understandings

Second Amendment to Note Purchase Agreement

                                       5

<PAGE>

among them concerning such matters. No statements or agreements, oral or
written, made prior to or at the signing hereof, shall vary, waive or modify the
written terms hereof.

                                    * * * * *

Second Amendment to Note Purchase Agreement

                                       6

<PAGE>

                                SIGNATURE PAGE TO
                               SECOND AMENDMENT TO
                             NOTE PURCHASE AGREEMENT

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

                             THE BORROWERS:

                             NUMATICS, INCORPORATED

                             By:      /s/ John H. Welker
                                 ---------------------------------------------
                                      John H. Welker
                                      Chief Executive Officer

                             NUMATICS, GMBH, a corporation organized
                             under the laws of the Federal Republic of Germany

                             By:      /s/ John H. Welker
                                 ---------------------------------------------
                             Name:    John H. Welker
                                   -------------------------------------------
                             Title:   General Manager
                                    ------------------------------------------

                             NUMATICS LTD., a Canadian corporation

                             By:      /s/ Robert P. Robeson
                                 ---------------------------------------------
                             Name:    Robert P. Robeson
                                   -------------------------------------------
                             Title:   Secretary
                                    ------------------------------------------

                             AGENT:

                             AMERICAN CAPITAL FINANCIAL SERVICES, INC.

                             By:      /s/ Mark D. Schindel
                                  --------------------------------------------
                                      Mark D. Schindel
                                      Vice President

Second Amendment to Note Purchase Agreement

                                      S-1

<PAGE>

                         PURCHASERS:

                         ACAS BUSINESS LOAN TRUST 2000-1

                         By:  AMERICAN CAPITAL STRATEGIES, LTD., as Servicer

                         By:      /s/ Mark D. Schindel
                              ------------------------------------------
                                  Mark Schindel, Vice President

                         ACAS FUNDING TRUST I

                         By:  AMERICAN CAPITAL STRATEGIES, LTD., as Servicer

                         By:      /s/ Mark D. Schindel
                              ------------------------------------------
                                  Mark Schindel, Vice President

                         AMERICAN CAPITAL STRATEGIES, LTD.

                         By:      /s/ Mark D. Schindel
                              ------------------------------------------
                                  Mark Schindel, Vice President

Second Amendment to Note Purchase Agreement

                                      S-2<PAGE>

                                                                     Exhibit 4.2

                               THIRD AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT

     THIS THIRD AMENDMENT TO LOAN AND SECURITY AGREEMENT (this "Amendment") is
made as of the 13th day of August, 2002 to the Loan and Security Agreement dated
November 28, 2001 (as previously amended, the "Loan Agreement") among Numatics,
Incorporated, Micro-Filtration, Inc., Numation, Inc., Numatech, Inc., Ultra Air
Products, Inc., Microsmith, Inc., Empire Automation Systems, Inc. (formerly
Empire Air Systems, Inc.) (each a "Borrower" and collectively "Borrowers") and
LaSalle Business Credit, Inc., as Lender and Collateral Agent. Unless otherwise
defined herein, capitalized terms used herein shall have the meanings ascribed
to them in the Loan Agreement.

     WHEREAS, Borrowers have requested that Lender amend the Loan Agreement in
certain respects and Lender has agreed to do so subject to the terms and
conditions hereof.

     WHEREAS, Borrowers have requested that Lender waive the Event of Default
arising from Borrowers' failure to maintain the Debt Service Coverage Ration and
Interest Coverage Ration required by Sections 14(b) and 14(c) of the Loan
Agreement as of June 30, 2002 (the "Existing Events of Default").

     NOW, THEREFORE, in consideration of the foregoing, and the mutual covenants
herein contained, and such other consideration as the parties mutually agree,
the parties hereto agree as follows:

     1.    Amendments. Borrowers and Lender agree that Sections 14(a), 14(b) and
14(c) of the Loan Agreement are amended and restated in their entirety to read
as follows:

     (a)  Tangible Net Worth.

          Borrowers shall not permit Tangible Net Worth at any time to be less
     than the Minimum Tangible Net Worth; "Minimum Tangible Net Worth" being
     defined for purposes of this subsection as (i) Fifteen Million Seven
     Hundred Thousand and No/100 Dollars ($15,700,000.00) at all times from
     November 28, 2001 through December 31, 2002, (ii) Eighteen Million Two
     Hundred Thousand and No/100 Dollars ($18,200,000.00) at all times from and
     including January 1, 2003 through December 30, 2003, and (iii) Twenty
     Million Seven Hundred Thousand and No/100 Dollars ($20,700,000.00) at all
     times from and including December 31, 2003 and thereafter; and "Tangible
     Net Worth" being defined for purposes of this subsection as Numatics'
     shareholders' equity (including retained earnings) on a consolidated basis
     less the book value of all intangible assets and all "Investments", "Other
     Current Assets", "Deferred Tax Assets" and "Other Assets" all as classified
     on Numatics' consolidated balance sheet, including, but not limited to,
     transaction costs not amortized, debt issuance costs not amortized and
     product drawings, as determined solely by Lender on a consistent basis less
     prepaid expenses and obligations due from officers, affiliates and
     employees plus the amount of any LIFO reserve plus the amount of any debt
     subordinated to the Liabilities in a manner satisfactory to Lender (but
     excluding the indebtedness evidenced by the Subordinated Redemption Note
     dated January 3, 2001 in the principal

<PAGE>

          amount of One Million Eighty-Nine Thousand Nine Hundred Ninety-Six and
          No/100 Dollars ($1,089,996.00) issued by Numatics to Bruce W. Hoppe
          and, to the extent in excess of Five Hundred Thousand and No/100
          Dollars ($500,000.00), indebtedness consisting of deferred
          compensation owing to John Welker) plus deferred tax liabilities, all
          as determined for Numatics and its Subsidiaries on a consolidated
          basis under generally accepted accounting principles applied on a
          basis consistent with the financial statement dated September 30, 2001
          except as set forth herein and calculated without giving effect to any
          unrealized non-cash foreign exchange gains and/or losses accumulating
          after December 31, 2001;

          (b)  Debt Service Coverage.

          Borrowers shall not permit Debt Service Coverage for any period of
     twelve (12) consecutive months ending on the last day of a fiscal quarter
     to be less than the ratio set forth below for such fiscal quarter:

<TABLE>
<CAPTION>
                             Period                                             Ratio
--------------------------------------------------------------               -----------
<S>                                                                          <C>
Each fiscal quarter comprising Borrowers' 2001 Fiscal Year and               1.00 to 1.0
the fiscal quarters ending March 31, 2002, June 30, 2002 and
September 30, 2002

The fiscal quarter ending December 31, 2002                                  1.05 to 1.0

Each fiscal quarter comprising Borrowers' 2003 Fiscal Year and               1.10 to 1.0
each fiscal quarter comprising any subsequent Fiscal Year of
Borrowers
</TABLE>

          (c)  Interest Coverage.

          Borrowers shall not permit the ratio of (i) Adjusted Net Income to
     (ii) scheduled payments of interest and fees, to the extent carried as
     interest expense on Numatics' and its Subsidiaries' consolidated financial
     statements, with respect to indebtedness for borrowed money (including the
     interest component payments with respect to capitalized leases) for any
     period of twelve (12) consecutive months ending on the last day of a fiscal
     quarter, to be less than the ratio set forth below for such fiscal quarter:

<TABLE>
<CAPTION>
                             Period                                             Ratio
--------------------------------------------------------------               -----------
<S>                                                                          <C>
Each fiscal quarter comprising Borrowers' 2001 Fiscal Year and               1.15 to 1.0
the fiscal quarters ending March 31, 2002 and June 30, 2002
</TABLE>

                                        2

<PAGE>

<TABLE>
<CAPTION>
                     Period                                                     Ratio
---------------------------------------------------------------              -----------
<S>                                                                          <C>
Borrowers' fiscal quarter ending September 30, 2002                          1.10 to 1.0
Borrowers' fiscal quarter ending December 31, 2002                           1.20 to 1.0
Each fiscal quarter, comprising Borrowers' 2003 Fiscal Year and              1.35 to 1.0
each fiscal quarter comprising any subsequent Fiscal Year of
Borrowers
</TABLE>

     2. Representations and Warranties of Borrowers. Each Borrower represents
and warrants that, as of the date hereof:

     (a) Each Borrower has the right and power and is duly authorized to enter
into this Agreement and all other agreements executed in connection herewith;

     (b) No Event of Default or an event or condition which upon notice, lapse
of time or both will constitute an Event of Default has occurred and is
continuing;

     (c) The execution, delivery and performance by each Borrower of this
Amendment and the other agreements to which such Borrower is a party (i) have
been duly authorized by all necessary action on its part; (ii) do not and will
not, by the lapse of time, giving of notice or otherwise, violate the provisions
of the terms of its Articles of Certificate of Incorporation or By-Laws, or of
any mortgage, indenture, security agreement, contract, undertaking or other
agreement to which such Borrower is a party, or which purports to be binding on
such Borrower or any of its properties; (iii) do not and will not, by lapse of
time, the giving of notice or otherwise, contravene any governmental restriction
to which such Borrower or any of its properties may be subject; and (iv) do not
and will not, except as contemplated in the Loan Agreement, result in the
imposition of any lien, charge, security interest or encumbrance upon any of
such Borrower's properties under any indenture, mortgage, deed of trust, loan or
credit agreement or other agreement or instrument to which such Borrower is a
party or which purports to be binding on such Borrower or any of its properties;

     (d) No consent, license, registration or approval of any governmental
authority, bureau or agency is required in connection with the execution,
delivery, performance, validity or enforceability of this Amendment and the
other agreements executed by any Borrower in connection herewith;

     (e) This Amendment and the other agreements executed by any Borrower in
connection herewith have been duly executed and delivered by any Borrower and
are enforceable against any Borrower in accordance with their terms; and

     (f) All information, reports and other papers and data heretofore furnished
to Lender or Collateral Agent by any Borrower in connection with this Amendment,
the Loan

                                       3

<PAGE>

Agreement and Other Agreements are accurate and correct in all material respects
and complete insofar as may be necessary to give Lender true and accurate
knowledge of the subject matter thereof. Each Borrower has disclosed to Lender
every fact of which it is aware which would reasonably be expected to materially
and adversely affect the business, operations or financial condition of such
Borrower or the ability of such Borrower to perform its obligations under this
Amendment, the Loan Agreement or under any of the Other Agreements. None of the
information furnished to Lender by or on behalf of any Borrower contained any
material misstatement of fact or omitted to state a material fact or any fact
necessary to make the statements contained herein or therein not materially
misleading.

     3. Conditions Precedent. The amendments to the Loan Agreement set forth in
this Amendment shall become effective as of the date of this Amendment when
Lender has received:

     (a) a copy of this Amendment executed by each party hereto;

     (b) an amendment fee of Twenty-Five Thousand and No/100 Dollars
($25,000.00); and

     (c) a copy of a fully executed amendment to the ACS Purchase Agreement in
form and substance satisfactory to Lender.

     4. Fees and Expenses. Borrowers agree to pay all legal fees and other
expenses, whether for in-house or outside counsel, incurred by Lender in
connection with this Agreement and the transactions contemplated hereby.

     5. Foreign Pledge Agreements. Borrowers agree to execute such documents and
take such actions as are necessary to grant Lender a valid and enforceable first
priority security interest in sixty-five percent (65%) of the equity in each of
Numatics S.A. de C.V. (Mexico), Numatics S.R.L. (Italy) and Numatics Ltd.
(Taiwan) by September 30, 2002. This Section 5 supersedes Section 5 of the
Second Amendment to the Loan and Security Agreement.

     6. Loan Agreement Remains in Force. Except as specifically amended hereby,
all of the terms and conditions of the Loan Agreement shall remain in full force
and effect and this Agreement shall not be a waiver of any rights or remedies
which Lender has provided for in the Loan Agreement and all such terms and
conditions are herewith ratified, adopted, approved and accepted.

     7. No Novation. This Amendment and all other agreements executed by
Borrowers on the date hereof are not intended to nor shall be construed to
create a novation or accord and satisfaction, and shall only be a modification
and extension of the existing Liabilities of Borrowers to Lender.

     8. Entire Agreement. This Amendment and the other documents it refers to
comprise the entire agreement relating to the subject matter they cover and
supersede any and all prior written or oral agreements among Lender and
Borrowers relating thereto.

                                       4

<PAGE>

     9. Severability. Any provision of this Amendment that is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the
remaining provisions hereof or affecting the validity or enforceability of such
provision in any other jurisdiction.

     Except as expressly provided for herein, the terms and conditions of the
Loan Agreement shall remain in full force and effect.

                                       5

<PAGE>

     IN WITNESS WHEREOF, Borrowers and Lender have caused this Amendment to be
duly executed by their proper duly authorized officers of the day and year
first set forth above.

                                                LASALLE BUSINESS CREDIT, INC.

                                                By  /s/ Dale P. Grzenia
                                                    -------------------
                                                Its Vice President
                                                    -------------------

                                                NUMATICS, INCORPORATED
                                                MICRO-FILTRATION, INC.
                                                NUMATION, INC.
                                                NUMATECH, INC.
                                                ULTRA AIR PRODUCTS, INC.
                                                MICROSMITH, INC.
                                                EMPIRE AUTOMATION SYSTEMS, INC.

                                                Each By /s/ Robert P. Robeson
                                                       ----------------------
                                                Their   Secretary
                                                       ----------------------

                                       6

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