Document:

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                                                                 EXHIBIT (10)(k)

                         MINE SAFETY APPLIANCES COMPANY

                            STOCK COMPENSATION TRUST

                          Effective as of June 1, 1996

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                                TABLE OF CONTENTS
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<TABLE>
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                                                                            PAGE
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<S>                                                                         <C>
ARTICLE 1.
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Trust, Trustee and Trust Fund............................................     1
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     1.1.    Trust.......................................................     1
             -----
     1.2.    Trustee.....................................................     2
             -------
     1.3.    Trust Fund..................................................     2
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     1.4.    Trust Fund Subject to Claims................................     2
             ----------------------------
     1.5.    Use of Trust................................................     3
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     1.6.    Definitions.................................................     3
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ARTICLE 2.
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Contributions and Dividends..............................................     5
---------------------------
     2.1.    Contributions...............................................     5
             -------------
     2.2.    Dividends...................................................     6
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ARTICLE 3.
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Release and Allocation of Company Stock..................................     6
---------------------------------------
     3.1.    Release of Shares...........................................     6
             -----------------
     3.2.    Allocations.................................................     6
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ARTICLE 4.
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Compensation, Expenses and Tax Withholding...............................     6
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     4.1.    Compensation and Expenses...................................     6
             -------------------------
     4.2.    Withholding of Taxes........................................     7
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ARTICLE 5.
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Administration of Trust Fund.............................................     7
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     5.1.    Management and Control of Trust Fund........................     7
             ------------------------------------
     5.2.    Investment of Funds.........................................     7
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     5.3.    Trustee's Administrative Powers.............................     8
             -------------------------------
     5.4.    Voting and Tendering of Company Stock.......................     9
             -------------------------------------
     5.5.    Indemnification.............................................    10
             ---------------
     5.6.    General Duty to Communicate to Committee....................    11
             ----------------------------------------

ARTICLE 6.
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Accounts and Reports of Trustee..........................................    12
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     6.1.    Records and Accounts of Trustee.............................    12
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     6.2.    Fiscal Year.................................................    12
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     6.3.    Reports of Trustee..........................................    12
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     6.4.    Final Report................................................    12
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ARTICLE 7.
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Succession of Trustee....................................................    12
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     7.1.    Resignation of Trustee......................................    12
             ----------------------
     7.2.    Removal of Trustee..........................................    13
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     7.3.    Appointment of Successor Trustee............................    13
             --------------------------------
     7.4.    Succession to Trust Fund Assets.............................    13
             -------------------------------
     7.5.    Continuation of Trust.......................................    13
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     7.6.    Changes in Organization of Trustee..........................    13
             ----------------------------------
     7.7.    Continuance of Trustee's Powers in Event of
             -------------------------------------------
</TABLE>

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<TABLE>
<S>                                                                          <C>
             Termination of the Trust....................................    14
             ------------------------
     7.8.    Corporate Trustee...........................................    14
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ARTICLE 8.
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Amendment or Termination.................................................    14
------------------------
     8.1.    Amendments..................................................    14
             ----------
     8.2.    Termination.................................................    14
             -----------
     8.3.    Form of Amendment or Termination............................    15
             --------------------------------

ARTICLE 9.
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Miscellaneous............................................................    15
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     9.1.    Controlling Law.............................................    15
             ---------------
     9.2.    Committee Action............................................    15
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     9.3.    Notices.....................................................    15
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     9.4.    Severability................................................    16
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     9.5.    Protection of Persons Dealing with the Trust................    16
             --------------------------------------------
     9.6.    Tax Status of Trust.........................................    16
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     9.7.    Participants to Have No Interest in the
             ---------------------------------------
             Company by Reason of the Trust..............................    16
             ------------------------------
     9.8.    Nonassignability............................................    17
             ----------------
     9.9.    Gender and Plurals..........................................    17
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     9.10.   Counterparts................................................    17
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</TABLE>

                                      -ii-

<PAGE>

                         MINE SAFETY APPLIANCES COMPANY
                            STOCK COMPENSATION TRUST

          THIS TRUST AGREEMENT (the "Agreement") made effective as of June 1,
1996, between Mine Safety Appliances Company, a Pennsylvania corporation, and
PNC Bank, N.A., as trustee.

                              W I T N E S S E T H :

          WHEREAS, the Company (as defined below) desires to establish a trust
(the "Trust") in accordance with the laws of the Commonwealth of Pennsylvania
and for the purposes stated in this Agreement;

          WHEREAS, the Trustee (as defined below) desires to act as trustee of
the Trust, for the purposes hereinafter stated and in accordance with the terms
hereof;

          WHEREAS, the Company or its subsidiaries have previously adopted the
Plans (as defined below);

          WHEREAS, the Company desires to provide assurance of the availability
of the shares of its common stock necessary to satisfy certain of its
obligations or those of its subsidiaries under the Plans (as defined below);

          WHEREAS, the Company desires that the assets to be held in the Trust
Fund (as defined below) should be principally or exclusively securities of the
Company and, therefore, expressly waives any diversification of investments that
might otherwise be necessary, appropriate, or required pursuant to applicable
provisions of law, if any; and

          WHEREAS, PNC Bank, N.A., has been appointed as trustee and has
accepted such appointment as of the date set forth first above;

          NOW, THEREFORE, the parties hereto hereby establish the Trust and
agree that the Trust will be comprised, held and disposed of as follows:

                                   ARTICLE 1.

                          Trust, Trustee and Trust Fund

          1.1. Trust. This Agreement and the Trust shall be known as the Mine
Safety Appliances Company Stock Compensation Trust. The parties intend that the
Trust will be an independent legal entity with title to and power to convey all
of its assets. The parties hereto further intend that the trust not be subject
to the Employee Retirement Income Security Act of 1974, as amended ("ERISA").
The Trust is not a part of any of the Plans (as herein defined). The assets of
the Trust will be held, invested and disposed of by the Trustee, in accordance
with the terms of the Trust. The Company will not knowingly take any action that
would cause the assets held pursuant to the Trust to become "plan assets" within
the meaning of ERISA without so advising the Trustee. The Trust is intended to
be a "grantor trust" within the meaning of Section 671 of the Internal Revenue
Code of 1986.

          1.2. Trustee. The trustee named above, and its successor or
successors, is hereby designated as the trustee hereunder, to receive, hold,
invest, administer and distribute the Trust Fund in accordance with this
Agreement, the provisions of which shall govern the power, duties and
responsibilities of the Trustee.

<PAGE>

          1.3. Trust Fund. The assets held at any time and from time to time
under the Trust collectively are herein referred to as the "Trust Fund" and
shall consist of contributions received by the Trustee, proceeds of any loans,
investments and reinvestment thereof, the earnings and income thereon, less
disbursements therefrom. Except as herein otherwise provided, title to the
assets of the Trust Fund shall at all times be vested in the Trustee and
securities that are part of the Trust Fund shall be held in such manner that the
Trustee's name and the fiduciary capacity in which the securities are held are
fully disclosed, subject to the right of the Trustee to hold title in bearer
form or in the name of a nominee, and the interests of others in the Trust Fund
shall be only the right to have such assets received, held, invested,
administered and distributed in accordance with the provisions of the Trust.

          1.4. Trust Fund Subject to Claims. Notwithstanding any provision of
this Agreement to the contrary, the Trust Fund shall at all times remain subject
to the claims of the Company's general creditors under federal and state law.

          In addition, the Board of Directors and Chief Executive Officer of the
Company shall have the duty to inform the Trustee in writing of the Company's
Insolvency (as defined below). If a person claiming to be a creditor of the
Company alleges in writing to the Trustee that the Company has become Insolvent,
the Trustee shall determine whether the Company is Insolvent and, pending such
determination, the Trustee shall discontinue allocations pursuant to Article 3.

          Unless the Trustee has actual knowledge of the Company's Insolvency,
or has received notice from the Company or a person claiming to be a creditor
alleging that the Company is Insolvent, the Trustee shall have no duty to
inquire whether the Company is Insolvent. The Trustee may in all events rely on
such evidence concerning the Company's solvency as may be furnished to the
Trustee and that provides the Trustee with a reasonable basis for making a
determination concerning the Company's Insolvency.

          If at any time the Trustee has determined that the Company is
Insolvent, the Trustee shall discontinue allocations

                                       -2-

<PAGE>

pursuant to Article 3 and shall hold the Trust Fund for the benefit of the
Company's general creditors. Nothing in this Trust Agreement shall in any way
diminish any rights of employees as general creditors of the Company with
respect to benefits due under the Plans or otherwise.

          The Trustee shall resume allocations pursuant to Article 3 only after
the Trustee has determined that the Company is not Insolvent or is no longer
Insolvent as the case may be.

          1.5  Use of Trust. The Trust Fund shall be used for the exclusive
purpose of aiding the Company in delivering the benefits provided by the Plans
and defraying the expenses of the Trust in accordance with this Trust Agreement.
The Company may terminate the Trust in accordance with Section 8.2 hereof, but,
income or corpus of the Trust Fund is recoverable by the Company only as
provided in Section 2.2 and 8.2.

          1.6. Definitions. In addition to the terms defined in the preceding
portions of the Trust, certain capitalized terms have the meanings set forth
below:

               Board of Directors. "Board of Directors" means the board of
directors of the Company.

               Change of Control. "Change of Control" means any of the following
events:

               (a) an acquisition by any individual, entity or group (within the
meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act")) of beneficial ownership (within the meaning of
Rule 13d-3 promulgated under the Exchange Act) of 50% or more of the combined
voting power of the then outstanding voting securities of the Company; provided,
however, that the following acquisitions shall not constitute a Change of
Control: (i) an acquisition by or directly from the Company, (ii) an acquisition
by any employee benefit plan or trust sponsored or maintained by the Company;
and (iii) any acquisition described in subclauses (A) or (B) of subsection (b)
below; or

               (b) approval by the stockholders of the Company of (i) a complete
dissolution or liquidation of the Company, (ii) a sale or other disposition of
all or substantially all of the Company's assets or (iii) a reorganization,
merger, or consolidation ("Business Combination") unless either (A) all or
substantially all of the stockholders of the Company immediately prior to the
Business Combination own more than 50% of the voting securities of the entity
surviving the Business Combination, or the entity which directly or indirectly
controls such surviving entity, in substantially the same pro-portion as they
owned the voting securities of the Company immediately prior thereto, or (B) the
consideration (other than cash paid in lieu of fractional shares or payment upon
perfection of appraisal rights) issued to stockholders of the Company in the
Business Combination is solely

                                       -3-

<PAGE>

common stock which is publicly traded on an established securities exchange in
the United States.

               Code. "Code" means the Internal Revenue Code of 1986, as amended.

               Committee. "Committee" means a committee of officers or other
individuals, subject to Section 9.2, appointed by the Board of Directors from
time to time to administer the Trust.

               Company. "Company" means Mine Safety Appliances Company, a
Pennsylvania corporation, or any successor thereto. References to the Company
shall include its subsidiaries where appropriate.

               Company Stock "Company Stock" means shares of common stock, no
par value, issued by the Company or any successor securities.

               Extraordinary Dividend. "Extraordinary Dividend" means any
dividend or other distribution of cash or other property (other than Company
Stock) made with respect to Company Stock, which the Board of Directors declares
generally to be other than an ordinary dividend.

               Fair Market Value. "Fair Market Value" means as of any date the
closing price quotation, or, if none, the average of the bid and asked prices,
as reported with respect to the Company Stock on the most recently available
date, on any national exchange on which the Company Stock is then listed, or if
not so listed, on the NASDAQ National Market, or other consolidated reporting
system reporting trades of the Company Stock. If the Company Stock is not so
listed, "Fair Market Value" shall mean the average of the bid and asked prices
as quoted by all market makers in the Company Stock. In the event that a market
for the Company Stock does not exist, the Committee may determine, in any case
or cases, that "Fair Market Value" shall be determined on the basis of the
opinion of one or more independent and reputable appraisers qualified to value
companies in the Company's line of business.

               Insolvency. "Insolvency" means (i) the inability of the Company
to pay its debts as they become due, or (2) the Company being subject to a
pending proceeding as a debtor under the provisions of Title 11 of the United
States Code (Bankruptcy Code).

               Loan. "Loan" means the loan and extension of credit to the Trust
evidenced by a promissory note dated as of the date of the Closing (as defined
in the Stock Purchase Agreement dated June 4, 1996 between the Trust and the
Company), with which the Trustee will purchase Company Stock.

                                       -4-

<PAGE>

               Option Grant. "Option Grant" means an option granted under one of
the Plans to a Plan Participant to acquire shares of Company Stock.

               Plan Committee Certification. "Plan Committee Certification"
means a certification to be provided to the Trustee by the Committee from time
to time which (i) sets forth the number of shares of Company Stock to be
transferred to a Plan Participant, and (ii) certifies that the determination of
such number is in accordance with the terms of each Plan.

               Plans. "Plans" means the employee plans listed on Schedule A
hereto and any other employee benefit plan of the Company or its subsidiaries
designated as such by the Board of Directors.

               Plan Participant. "Plan Participant" means an individual who has
an Option Grant under any of the Plans.

               Suspense Account. "Suspense Account" means the account in which
shares of Company Stock acquired with the Loan are held until they are released
pursuant to Section 3.1.

               Trustee. "Trustee" means PNC Bank, N.A., or any successor
trustee.

               Trust Year. "Trust Year" means the period beginning on the date
of the Closing (the "Closing Date") and ending on the next following December
31st and on each December 31st thereafter.

                                   ARTICLE 2.

                           Contributions and Dividends

          2.1. Contributions. For each Trust Year the Company shall contribute
to the Trust in cash such amount, which together with dividends, as provided in
Section 2.2, and any other earnings of the Trust, shall enable the Trustee to
make all payments of principal and interest due under the Loan on a timely
basis. Unless otherwise expressly provided herein, the Trustee shall apply all
such contributions, dividends and earnings to the payment of principal and
interest due under the Loan. If, at the end of any Trust Year, no such
contribution has been made in cash, such contribution shall be deemed to have
been made in the form of forgiveness of principal and interest on the Loan to
the extent of the Company's failure to make contributions as required by this
Section 2.1. The Company may from time to time, in its sole discretion, make
additional contributions to the Trust for the purpose of enabling the Trust to
make prepayments of principal with respect to the Loan (a "Prepayment
Contribution"). The Trustee shall immediately use any Prepayment Contribution to
make a prepayment of principal with respect to the Loan. All contributions made
under the Trust shall be delivered to the

                                       -5-

<PAGE>

Trustee. The Trustee shall be accountable for all contributions received by it,
but shall have no duty to require any contributions to be made to it.

          2.2. Dividends. Except as otherwise provided herein, dividends paid in
cash on Company Stock held by the Trust, including Company Stock held in the
Suspense Account, shall be applied to pay interest and repay scheduled principal
due under the Loan. In the event that dividends paid on Company Stock held in
the Trust, other than Extraordinary Dividends, exceed the amount of scheduled
principal and interest due in any Trust Year, such excess shall be used to
purchase additional shares of Company Stock and/or shall be distributed to a
broad cross-section of individuals employed by the Company, as determined in
good faith by the Committee. Dividends which are not in cash or in Company Stock
(including Extraordinary Dividends, or portions thereof) shall be reduced to
cash by the Trustee and reinvested in Company Stock as soon as practicable. For
purposes of this Agreement, Company Stock purchased with the proceeds of an
Extraordinary Dividend, any excess dividend or with the proceeds of a non-cash
dividend shall for purposes of this Agreement (including without limitation
Section 3.1 hereof), be deemed to have been acquired with the proceeds of the
Loan. In the Trustee's discretion, investments in Company Stock may be made
through open-market purchases, private transactions or (with the Company's
consent) purchases from the Company.

                                   ARTICLE 3.

                     Release and Allocation of Company Stock

          3.1. Release of Shares. Upon any payment (including a prepayment) or
forgiveness in any Trust Year of any principal on the Loan (a "Principal
Payment"), the following number of shares of Company Stock acquired with the
proceeds of the Loan shall be available for allocation ("Available Shares") as
provided in this Article 3: the number of shares so acquired and held in the
Suspense Account immediately before such payment or forgiveness, multiplied by a
fraction the numerator of which is the amount of the Principal Payment and the
denominator of which is the sum of such Principal Payment and the remaining
principal of the Loan outstanding after such Principal Payment.

          3.2. Allocations. Available Shares shall be allocated as directed by a
Plan Committee Certification to the Plan Participants at such times as may be
required to provide shares in accordance with the Plans.

                                   ARTICLE 4.

                   Compensation, Expenses and Tax Withholding

          4.1. Compensation and Expenses. The Trustee shall be entitled to such
reasonable compensation for its services as may

                                       -6-

<PAGE>

be agreed upon from time to time by the Company and the Trustee and to be
reimbursed for its reasonable legal, accounting and appraisal fees, out-of-
pocket expenses and other charges reasonably incurred in connection with the
administration, management, investment and distribution of the Trust Fund. Such
compensation shall be paid, and such reimbursement shall be made out of the
Trust Fund. The Company agrees to make sufficient contributions to the Trust to
pay such amounts owing the Trustee in addition to those contributions required
by Section 2.1 and, in the event the Company fails to make the contributions
necessary to pay amounts owing to the Trustee, the Trustee shall be entitled to
seek payment directly from the Company or the Trust Fund.

          4.2. Withholding of Taxes. The Trustee may withhold, require
withholding, or otherwise satisfy its withholding obligation, on any
distribution which it is directed to make. The amount to be withheld shall be
such amount as the Company advises the Trustee it reasonably estimates to be
necessary to comply with applicable federal, state and local withholding
requirements. Upon determination of the tax withholding liability, the Trustee
shall distribute the balance of the distribution to the appropriate Participant
and deliver to the Company the amount necessary to satisfy any withholding
obligation. The Company will then deliver the withholding amount to the
appropriate governmental entity. Prior to making any distribution hereunder, the
Trustee may require such indemnity, as the Trustee shall reasonably deem
necessary for its protection.

                                   ARTICLE 5.

                          Administration of Trust Fund

          5.1. Management and Control of Trust Fund. Subject to the terms of
this Agreement, the Trustee shall have exclusive authority and responsibility to
manage and control the assets of the Trust Fund. The Trustee's duties shall be
limited to those duties specified in this Agreement.

          5.2. Investment of Funds. Except as otherwise provided in Section 2.2
and in this Section 5.2, the Trustee shall invest and reinvest the Trust Fund
exclusively in Company Stock, including any accretions thereto resulting from
the proceeds of a tender offer, recapitalization or similar transaction which,
if not in Company Stock, shall be reduced to cash as soon as practicable. To the
extent the Trust Fund is invested in Company Stock, the Company waives any
diversification of investments that might otherwise be necessary, appropriate or
required pursuant to applicable law. The Trustee may invest any portion of the
Trust Fund temporarily pending investment in Company Stock, distribution or
payment of expenses in (i) investments in United States Government obligations
with maturities of less than one year, (ii) interest- bearing accounts including
but not limited to

                                       -7-

<PAGE>

certificates of deposit, time deposits, saving accounts and money market
accounts with maturities of less than one year in any bank, including the
Trustee, with aggregate capital in excess of $1,000,000,000 and a Moody's
Investor Services rating of at least P1, or an equivalent rating from a
nationally recognized ratings agency, which accounts are insured by the Federal
Deposit Insurance Corporation or other similar federal agency, (iii) obligations
issued or guaranteed by any agency or instrumentality of the United States of
America with maturities of less than one year, (iv) short-term discount
obligations of the Federal National Mortgage Association or (v) any mutual fund
or funds which invests primarily in one or more of the above-described
investments, including funds for which Trustee or its affiliates provide
investment advisory, custodian, transfer agent or other services.

          5.3. Trustee's Administrative Powers. Except as otherwise provided
herein, and subject to the Trustee's duties hereunder, the Trustee shall have
the following powers and rights, in addition to those provided elsewhere in this
Agreement or by law:

          (a) to retain any asset of the Trust Fund;

          (b) subject to Section 5.4 and Article 3, to sell, transfer, mortgage,
pledge, lease or otherwise dispose of, or grant options with respect to, any
Trust Fund assets at public or private sale;

          (c) upon direction from the Committee, to borrow from any lender
(including the Company pursuant to the Loan), to acquire Company Stock at Fair
Market Value as authorized by this Agreement, to enter into lending agreements
upon such terms (including reasonable interest and security for the loan and
rights to renegotiate and prepay such loan) as may be determined by the
Committee; provided, however, that any collateral given by the Trustee for the
Loan shall be limited to cash and property contributed by the Company to the
Trust and dividends paid on Company Stock held in the Trust and shall not
include Company Stock acquired with the proceeds of Loan;

          (d) with the consent of the Committee, to settle, submit to
arbitration, compromise, contest, prosecute or abandon claims and demands in
favor of or against the Trust Fund;

          (e) to vote or to give any consent with respect to any securities,
including any Company Stock, held by the Trust either in person or by proxy for
any purpose, provided that the Trustee shall vote, tender or exchange all shares
of Company Stock as provided in Section 5.4;

          (f) to exercise any of the powers and rights of an individual owner
with respect to any asset of the Trust Fund

                                       -8-

<PAGE>

and to perform any and all other acts that in its judgment are necessary or
appropriate for the proper administration of the Trust Fund, even though such
powers, rights and acts are not specifically enumerated in this Agreement;

          (g)  to employ such accountants, actuaries, investment bankers,
appraisers, other advisors and agents as may be reasonably necessary in
collecting, managing, administering, investing, valuing, distributing and
protecting the Trust Fund or the assets thereof or any borrowings of the Trustee
made in accordance with Section 5.3(c); and to pay their reasonable fees and
out-of-pocket expenses, which shall be deemed to be expenses of the Trust and
for which the Trustee shall be reimbursed in accordance with Section 4.1;

          (h)  to cause any asset of the Trust Fund to be issued, held or
registered in the Trustee's name or in the name of its nominee, or in such form
that title will pass by delivery, provided that the records of the Trustee shall
indicate the true ownership of such asset;

          (i)  to utilize another entity as custodian to hold, but not invest or
otherwise manage or control, some or all of the assets of the Trust Fund; and

          (j)  to consult with legal counsel (who may also be counsel for the
Trustee generally) with respect to any of its duties or obligations hereunder;
and to pay the reasonable fees and out-of-pocket expenses of such counsel, which
shall be deemed to be expenses of the Trust and for which the Trustee shall be
reimbursed in accordance with Section 4.1.

Notwithstanding the foregoing, neither the Trust nor the Trustee shall have any
power to, and shall not, engage in any trade or business.

          5.4. Voting and Tendering of Company Stock.

          (a)  Voting of Company Stock. The Trustee shall follow the directions
of each Plan Participant other than Plan Participants who are members of the
Board of Directors of the Company (such non-members being hereinafter the
"Directing Plan Participants"), as to the manner in which shares of Company
Stock held by the Trust are to be voted on each matter brought before an annual
or special stockholders' meeting of the Company or the manner in which any
consent is to be executed, in each case as provided below. Before each such
meeting of stockholders, the Trustee shall cause to be furnished to each
Directing Plan Participant, a copy of the proxy solicitation material received
by the Trustee, together with a form requesting confidential instructions as to
how to vote the shares of Company Stock held by the Trustee. Upon timely receipt
of directions from the Directing Plan Participants, the Trustee shall on each
such

                                       -9-

<PAGE>

matter vote the number of shares (including fractional shares) of Company Stock
held by the Trust as follows:

          The Company Stock shall be voted by the Trustee as directed by the
Directing Plan Participants with each Directing Plan Participant directing a
number of shares of Company Stock (the "Participant Directed Amount") equal to
the quotient of (x) the total number of shares of Company Stock held by the
Trust and (y) the number of Directing Plan Participants on the relevant date.
Any Shares for which the Trustee does not receive a signed voting-direction
instrument shall be voted for, against or to abstain in the same proportions as
those shares of Company Stock for which the Trustee did receive instructions.

          Similar provisions shall apply in the case of any action by
shareholder consent without a meeting.

          (b)  Tender or Exchange of Company Stock. The Trustee shall use its
best efforts timely to distribute or cause to be distributed to each Plan
Participant any written materials distributed to stockholders of the Company
generally in connection with any tender offer or exchange offer, together with a
form requesting confidential instructions as to whether or not to tender or
exchange shares of Company Stock held in the Trust. Upon timely receipt of
instructions from a Directing Plan Participant, the Trustee shall tender such
Directing Participant's Participant Directed Amount if such Directing Plan
Participant has directed the Trustee to tender. The Company will cooperate in
registering the Company Stock held by the Trust which is the subject of a tender
or exchange offer. The Company shall be responsible for all expenses incurred in
connection with the registration of such Company Stock.

          (c)  The Company shall maintain appropriate procedures to ensure that
all instructions by Directing Plan Participants in the Plans are collected,
tabulated, and transmitted to the Trustee without being divulged or released to
any person affiliated with the Company or its affiliates. All actions taken by
Directing Plan Participants shall be held confidential by the Trustee and shall
not be divulged or released to any person, other than (i) agents of the Trustee
who are not affiliated with the Company or its affiliates or (ii) by virtue of
the execution by the Trustee of any proxy, consent or letter of transmittal for
the shares of Company Stock held in the Trust.

          5.5. Indemnification.

          (a)  The Company shall and hereby does indemnify and hold harmless the
Trustee from and against any claims, demands, actions, administrative or other
proceedings, causes of action, liability, loss, cost, damage or expense
(including reasonable attorneys' fees), which may be asserted against it, in any
way arising out of or incurred as a result of its action or failure to act in
connection with the establishment, operation and administration of the Trust;
provided that such indemnification

                                      -10-

<PAGE>

shall not apply to the extent that a court of competent jurisdiction finally
determines that the Trustee has acted (i) negligently, (ii) in violation of
applicable law or its duties under this Trust or (iii) in bad faith. The Trustee
shall be under no liability to any person for any loss of any kind which may
result (i) by reason of any action taken by the Trustee in accordance with any
direction of the Committee or any Directing Plan Participant acting pursuant to
Section 5.4 (ii) by reason of the Trustee's failure to exercise any power or
authority or to take any action hereunder because of the failure of any such
Directing Plan Participant to give directions to the Trustee, as provided for in
this Agreement, or (iii) by reason of any act or omission of any of the
Directing Plan Participants with respect to the Trustee's duties under this
Trust. The Trustee shall be fully protected in acting upon any instrument,
certificate, or paper delivered by the Committee or any Plan Participant or
beneficiary and believed in good faith by the Trustee to be genuine and to be
signed or presented by the proper person or persons, and the Trustee shall be
under no duty to make any investigation or inquiry as to any statement contained
in any such writing, but may accept the same as conclusive evidence of the truth
and accuracy of the statements therein contained.

          (b)  The Company may, but shall not be required to, maintain liability
insurance to insure its obligations hereunder. If any payments made by the
Company or the Trust pursuant to this indemnity are covered by insurance
maintained by the Company, the Company or the Trust (as applicable) shall be
subrogated to the rights of the indemnified party against the insurance company.

          (c)  Without limiting the generality of the foregoing, the Company
will, at the request of the Trustee, advance to the Trustee reasonable amounts
of expenses, including reasonable attorneys' fees and expenses, which the
Trustee advises have been incurred in connection with its investigation or
defense of any claim, demand, action, cause of action, administrative or other
proceeding arising out of or in connection with the Trustee's performance of its
duties under this Agreement.

          (d)  In no event shall the Trustee be liable for consequential
damages.

          (e)  The Trustee may initiate an action in interpleader with respect
to any issue under this Agreement and the Company shall indemnify the Trustee
from and against any reasonable legal expenses incurred by the Trustee in
connection therewith.

          5.6. General Duty to Communicate to Committee. The Trustee shall
promptly notify the Committee of all communications with or from any government
agency or with respect to any legal proceeding with regard to the Trust and with
or from any Plan Participants concerning their entitlements under the Plans or
the Trust.

                                      -11-

<PAGE>

                                   ARTICLE 6.

                         Accounts and Reports of Trustee

          6.1. Records and Accounts of Trustee. The Trustee shall maintain
accurate and detailed records and accounts of all transactions of the Trust,
which shall be available at all reasonable times for inspection or audit by any
person designated by the Company and which shall be retained as required by
applicable law.

          6.2. Fiscal Year. The fiscal year shall be the same as the Trust Year.
The fiscal year of the Trust shall be the twelve month period or a shorter
period in the case of the initial fiscal year.

          6.3. Reports of Trustee. The Trustee shall prepare and present to the
Committee a report for the period ending on the last day of each fiscal year,
and for such shorter periods as the Committee may reasonably request, listing
all securities and other property acquired and disposed of and all receipts,
disbursements and other transactions effected by the Trust after the date of the
Trustee's last account, and further listing all cash, securities, and other
property held by the Trust, together with the fair market value thereof, as of
the end of such period. In addition to the foregoing, the report shall contain
such information regarding the Trust Fund's assets and transactions as the
Committee in its discretion may reasonably request.

          The Committee may approve of any report furnished by the Trustee
pursuant to the foregoing paragraph either by written statement of approval
furnished to the Trustee or shall be deemed to have approved any such report by
failure to file written objection to the report with the Trustee within one
hundred and eighty (180) days of the date on which the Committee received the
report. The Committee shall not be liable to any person for the approval,
disapproval or failure to approve or object to any report rendered by the
Trustee.

          6.4. Final Report. In the event of the resignation or removal of a
Trustee hereunder, the Committee may request and the Trustee shall then with
reasonable promptness submit, for the period ending on the effective date of
such resignation or removal, a report similar in form and purpose to that
described in Section 6.3.

                                   ARTICLE 7.

                              Succession of Trustee

          7.1. Resignation of Trustee. The Trustee or any successor thereto may
resign as Trustee hereunder at any time upon delivering a written notice of such
resignation, to take effect thirty (30) days after the delivery thereof to the

                                      -12-

<PAGE>

Committee, unless the Committee accepts shorter notice; provided, however, that
no such resignation shall be effective until a successor Trustee has assumed the
office of Trustee hereunder.

          7.2. Removal of Trustee. The Trustee or any successor thereto may be
removed by the Company by delivering to the Trustee so removed an instrument
executed by the Committee informing the Trustee of the Committee's decision.
Such removal shall take effect at the date specified in such instrument, which
shall not be less than thirty (30) days after delivery of the instrument, unless
the Trustee accepts shorter notice; provided, however, that no such removal
shall be effective until a successor Trustee has assumed the office of Trustee
hereunder.

          7.3. Appointment of Successor Trustee. Whenever the Trustee or any
successor thereto shall resign or be removed or a vacancy in the position shall
otherwise occur, the Company shall use its best efforts to appoint a successor
Trustee as soon as practicable after receipt by the Committee of a notice
described in Section 7.1, or the delivery to the Trustee of a notice described
in Section 7.2, as the case may be, but in no event more than sixty (60) days
after receipt or delivery, as the case may be, of such notice. A successor
Trustee's appointment shall not become effective until such successor shall
accept such appointment by delivering its acceptance in writing to the Company.
If a successor is not appointed within such 60 day period, the Trustee, at the
Company's expense, may petition a court of competent jurisdiction for
appointment of a successor.

          7.4. Succession to Trust Fund Assets. The title to all property held
hereunder shall vest in any successor Trustee acting pursuant to the provisions
hereof without the execution or filing of any further instrument, but a
resigning or removed Trustee shall execute all instruments and do all acts
necessary to vest title in the successor Trustee. Each successor Trustee shall
have, exercise and enjoy all of the powers, both discretionary and ministerial,
herein conferred upon its predecessors. A successor Trustee shall not be obliged
to examine or review the accounts, records, or acts of, or property delivered
by, any previous Trustee and shall not be responsible for any action or any
failure to act on the part of any previous Trustee.

          7.5. Continuation of Trust. In no event shall the legal disability,
resignation or removal of a Trustee terminate the Trust, but the Company shall
forthwith appoint a successor Trustee in accordance with Section 7.3 to carry
out the terms of the Trust.

          7.6. Changes in Organization of Trustee. In the event that any
corporate Trustee hereunder shall be converted into, shall merge or consolidate
with, or shall sell or transfer substantially all of its assets and business to,
another corporation, state or federal, the corporation resulting from such
conversion, merger or consolidation, or the corporation to

                                      -13-

<PAGE>

which such sale or transfer shall be made, shall thereupon become and be the
Trustee under the Trust with the same effect as though originally so named.

          7.7. Continuance of Trustee's Powers in Event of Termination of the
Trust. In the event of the termination of the Trust, as provided herein, the
Trustee shall dispose of the Trust Fund in accordance with the provisions
hereof. Until the final distribution of the Trust Fund, the Trustee shall
continue to have all powers provided hereunder as necessary or expedient for the
orderly liquidation and distribution of the Trust Fund.

          7.8. Corporate Trustee. The Trustee or any successor Trustee shall
be an independent corporate entity with assets of at least $15 billion.

                                   ARTICLE 8.

                            Amendment or Termination

          8.1. Amendments. Except as otherwise provided herein, the Company
may amend the Trust at any time and from time to time in any manner which it
seems desirable, provided that no amendment shall permit the Company to receive
any distribution prohibited by the last sentence of Section 1.5 hereof and no
amendment which would adversely affect the duties of the Trustee shall be made
without the Trustee's written consent, which consent shall not be unreasonably
withheld. Notwithstanding the foregoing, the Company shall retain the power
under all circumstances to amend the Trust to correct any errors or clarify any
ambiguities or similar issues of interpretation in this Agreement, except to the
extent any such amendment adversely affects the duties of the Trustee.

          8.2. Termination. Subject to the terms of this Section 8.2, the
Trust shall terminate on the earliest of the date (i) all available shares are
distributed, (ii) on which the Loan is paid in full and (iii) the 20th
anniversary of the effective date of the Trust (the "Termination Date"). The
Company may terminate the Trust at any time prior to the Termination Date. The
Trust shall also terminate automatically upon the Company giving the Trustee
written notice of a Change of Control. Immediately upon a termination of the
Trust, the Company shall be deemed to have forgiven all amounts then outstanding
under the Loan. As soon as practicable after receiving notice from the Company
of a Change of Control or upon any other termination of the Trust, the Trustee
shall sell all of the Company Stock and other non-cash assets (if any) then held
in the Trust Fund provided, that the Trustee will not be required to sell such
Company Stock unless such sale can be completed without violating applicable
securities laws. In the event of a Change of Control or any other termination of
the Trust, the Company will cooperate in registering the Company Stock held by
the Trust. The Company shall be responsible for all expenses

                                      -14-

<PAGE>

incurred in connection with the registration of such Company Stock. The proceeds
of such sale shall first be returned to the Company up to an amount equal to the
principal amount, plus any accrued interest, of the Loan that was forgiven upon
such termination. Any funds remaining in the Trust after such payment to the
Company (the "Excess Funds") shall be used to fund (1) the existing obligations
of the Company under (i) the Plans and, then, (ii) all broad-based employee
benefit plans maintained by the Company, and (2) the anticipated future
obligations of the Company to the pre Change-of-Control employee population
under one or more broad based employee plans, and, (3) if any Excess Funds
remain, such amount shall be paid directly to the active participants in the
Company's 401(k) defined contribution plan in proportion to each participant's
base pay. Any determination as to which plans are entitled to funding pursuant
to this paragraph or the extent of any obligation to such plan shall be made by
the Committee.

          8.3.  Form of Amendment or Termination. Any amendment or termination
of the Trust shall be evidenced by an instrument in writing signed by an
authorized officer of the Company, certifying that said amendment or termination
has been authorized and directed by the Company or the Board of Directors, as
applicable, and, in the case of any amendment, shall be consented to by
signature of an authorized officer of the Trustee, if required by Section 8.1.

                                   ARTICLE 9.

                                  Miscellaneous

          9.l.  Controlling Law. The laws of the Commonwealth of Pennsylvania
shall be the controlling law in all matters relating to the Trust, without
regard to conflicts of law.

          9.2.  Committee Action. Any action required or permitted to be taken
by the Committee may be taken on behalf of the Committee by any individual so
authorized. The Company shall furnish to the Trustee the name and specimen
signature of each member of the Committee upon whose statement of a decision or
direction the Trustee is authorized to rely. Until notified of a change in the
identity of such person or persons, the Trustee shall act upon the assumption
that there has been no change. In the event that a Change of Control occurs, the
Board of Directors shall no longer have the authority to remove or appoint
members of the Committee and the members of the Committee in place immediately
preceding such a Change of Control shall continue as such members and shall have
the authority to appoint new members to replace any members who resign or
otherwise cease to be members after the Change of Control.

          9.3.  Notices. All notices, requests, or other communications
required or permitted to be delivered hereunder

                                      -15-

<PAGE>

shall be in writing, delivered by registered or certified mail, return receipt
requested as follows:

                    To the Company

                        Donald H. Cuozzo, Esquire
                        Secretary
                        Mine Safety Appliances Company
                        P.O. Box 426
                        Pittsburgh, PA 15230

                    To the Trustee:

                        PNC Bank, N.A.
                        One Oliver Plaza
                        27th Floor
                        6th Avenue
                        Pittsburgh, PA 15222

                        Attn: Frank Leja, Vice President

Any party hereto may from time to time, by written notice given as aforesaid,
designate any other address to which notices, requests or other communications
addressed to it shall be sent.

          9.4. Severability. If any provision of the Trust shall be held
illegal or invalid or unenforceable for any reason, such provision shall not
affect the remaining parts hereof, but the Trust shall be construed and enforced
as if said provision had never been inserted herein.

          9.5. Protection of Persons Dealing with the Trust. No person dealing
with the Trustee shall be required or entitled to monitor the application of any
money paid or property delivered to the Trustee, or determine whether or not the
Trustee is acting pursuant to authorities granted to it hereunder or to
authorizations or directions herein required.

          9.6. Tax Status of Trust. It is intended that the Company, as
grantor hereunder, be treated as the owner of the entire Trust and the trust
assets under Section 671 et seq. of the Code. Until advised otherwise, the
Trustee may presume that the Trust is so characterized for federal income tax
purposes and shall make all filings of tax returns on that presumption.

          9.7. Participants to Have No Interest in the Company by Reason of the
Trust. Neither the creation of the Trust nor an anything contained in the Trust
shall be construed as giving any person, including any individual employed by
the Company or any subsidiary of the Company, any equity or interest in the
assets, business, or affairs of the Company except to the extent that any such
individuals are entitled to exercise stockholder rights with respect to Company
Stock pursuant to Section 5.4.

                                      -16-

<PAGE>

          9.8.  Nonassignability. No right or interest of any person to receive
distributions from the Trust shall be assignable or transferable, in whole or in
part, either directly or by operation of law or otherwise, including, but not by
way of limitation, execution, levy, garnishment, attachment, pledge, or
bankruptcy, but excluding death or mental incompetency, and no right or interest
of any person to receive distributions from the Trust shall be subject to any
obligation or liability of any such person, including claims for alimony or the
support of any spouse or child.

          9.9.  Gender and Plurals. Whenever the context requires or permits,
the masculine gender shall include the feminine gender and the singular form
shall include the plural form and shall be interchangeable.

          9.10. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be considered an original.

          IN WITNESS WHEREOF, the Company and the Trustee have caused this
Agreement to be signed, and their seals affixed hereto, by their authorized
officers all as of the day, month and year first above written.

                                 PNC BANK, N.A.

                                 By: /s/ Frank H. Leja
                                    ------------------------------
                                 Title: Vice President
                                       ---------------------------

                                 Attest: /s/ Howard H. Giles
                                        --------------------------
                                 Title: Ass't. Vice President
                                        --------------------------

                                 MINE SAFETY APPLIANCES COMPANY

                                 By: /s/ D. L. Zeitler
                                     -----------------------------
                                  Title: Treasurer
                                         -------------------------

                                 Attest: /s/ D. H. Cuozzo
                                 ---------------------------------
                                 Title: Secretary
                                        --------------------------

                                      -17-

<PAGE>

                                   SCHEDULE A

                             Employee Benefit Plans

1.   Mine Safety Appliances Company 1987 Management Share Incentive Plan

2.   Mine Safety Appliances Company 1990 Non-Employee Directors' Stock Option
     Plan.

3.   1998 Management Share Incentive Plan. Amended as of 5-5-98 Board Meeting

                                      -18-<PAGE>
                                                                 Exhibit (10)(l)

                         MSA SUPPLEMENTAL SAVINGS PLAN

                            As Amended and Restated

                           Effective January 1, 2003

<PAGE>

                          MSA SUPPLEMENTAL SAVINGS PLAN

                                TABLE OF CONTENTS

Article                                                                     Page

                       Preamble

ARTICLE I              Definitions..........................................1

ARTICLE II             Participation........................................9

ARTICLE III            The Supplemental Account.............................9

ARTICLE IV             Participant-Direction of Investment.................13

ARTICLE V              Vesting.............................................15

ARTICLE VI             Distribution of Benefits............................16

ARTICLE VII            General Provisions..................................18

APPENDIX A

APPENDIX B

                                       2

<PAGE>

                          MSA SUPPLEMENTAL SAVINGS PLAN

     Mine Safety Appliances Company (the "Company") hereby amends and restates
this MSA SUPPLEMENTAL SAVINGS PLAN (the "Plan") effective January 1, 2003 as
provided below.

     WHEREAS, the Company maintains the MSA Retirement Savings Plan (the
"Retirement Savings Plan") for the benefit of the its employees; and

     WHEREAS, the Retirement Savings Plan is a qualified plan under Section
401(a) of the Internal Revenue Code of 1986, as amended (the "Code") and
provides for elective deferrals up to 25% of compensation as permitted under
Code Section 401(k) and matching contributions of 50% of each dollar deferred up
to a maximum of 8% of compensation as permitted under Code Section 401(m); and

     WHEREAS, the Company first adopted the Plan effective January 1, 1987 to
provide benefits to certain executive employees that could not be provided under
the Retirement Savings Plan on account of Code Section 415; and

     WHEREAS, the Plan was amended and restated effective January 1, 1997 to
include additional benefits for participants on account of the application of
other qualified plan limits under the Retirement Savings Plan; and

     WHEREAS, the Plan was most recently amended and restated effective December
1, 1999, to make certain changes regarding the investment of funds allocated
under the Plan and to provide protection to participants in the event of a
change in control of the Company; and

     WHEREAS, the Company desires to amend and restate the Plan to provide
additional flexibility with regard to the elections to defer and receive
benefits under the Plan and to make certain other changes.

     NOW THEREFORE, the Plan is hereby amended and restated as follows:

                                    ARTICLE I

                                   DEFINITIONS

                                       3

<PAGE>

          Unless otherwise specifically defined in this Article I or where a
term first appears in this Plan, all capitalized terms used in this Plan shall
have the same meanings as are ascribed to them under the Company's Retirement
Savings Plan.

          1.1 "Administrator" means the Retirement Savings Plan Committee, as
appointed by the Board from time to time, unless the Board shall expressly
appoint another Administrator. The Administrator may, by written notice of
appointment delivered to any other person or persons (whether legal or natural),
designate and allocate any fiduciary responsibility to such other person or
persons, who may also serve in more than one fiduciary capacity with respect to
the Plan.

          1.2 "Amendment Effective Date" means January 1, 2003.

          1.3 "Beneficiary" means the person or persons designated by a
Participant (in accordance with procedures established by the Administrator) to
receive the value of his Supplemental Account in the event of his death prior to
receipt of all benefits due hereunder, or, if no such person is designated by a
Participant, Beneficiary means the person or persons designated by the
Participant under the provisions of the Retirement Savings Plan to receive the
value of his account thereunder in the event of his death prior to receipt of
all benefits due thereunder.

          1.4 "Board" means the Board of Directors of Mine Safety Appliances
Company, or any successor thereto.

          1.5 "Bonus" means the annual Coordinating Committee Bonus, if any paid
by the Company. The term Bonus shall not include any other bonuses paid by the
Company.

          1.6 "Change in Control" of the Company shall be deemed to have
occurred if the event set forth in any one of the following paragraphs shall
have occurred:

                                       4

<PAGE>

               (I) any Person (as defined in this Section 1.5) is or becomes the
     Beneficial Owner (as defined in this Section 1.5), directly or indirectly,
     of securities of the Company (not including in the securities beneficially
     owned by such Person any securities acquired directly from the Company or
     its Affiliates (which term shall have the meaning set forth in Rule 12b-2
     promulgated under Section 12 of the Exchange Act, as defined in this
     Section 1.5)) representing thirty percent (30%) or more of the combined
     voting power of the Company's then outstanding securities, excluding any
     Person who becomes such a Beneficial Owner in connection with a transaction
     described in clause (I) of paragraph (III) below; or

               (II) the following individuals cease for any reason to constitute
     a majority of the number of directors then serving: individuals who, on May
     7, 2002, constitute the Board and any new director (other than a director
     whose initial assumption of office is in connection with an actual or
     threatened election contest, including but not limited to a consent
     solicitation, relating to the election of directors of the Company) whose
     appointment or election by the Board or nomination for election by the
     Company's shareholders was approved or recommended by a vote of at least
     two-thirds (2/3) of the directors then still in office who either were
     directors on May 7, 2002, or whose appointment, election or nomination for
     election was previously so approved or recommended; or

               (III) there is consummated a merger or consolidation of the
     Company or any direct or indirect subsidiary of the Company with any other
     corporation, other than (I) a merger or consolidation which would result in
     the

                                       5

<PAGE>

     voting securities of the Company outstanding immediately prior to such
     merger or consolidation continuing to represent (either by remaining
     outstanding or by being converted into voting securities of the surviving
     entity or any parent thereof), in combination with the ownership of any
     trustee or other fiduciary holding securities under an employee benefit
     plan of the Company or any subsidiary of the Company, at least fifty-one
     percent (51%) of the combined voting power of the securities of the Company
     or such surviving entity or any parent thereof outstanding immediately
     after such merger or consolidation, or (ii) a merger or consolidation
     effected to implement a recapitalization of the Company (or similar
     transaction) in which no Person is or becomes the Beneficial Owner,
     directly or indirectly, of securities of the Company representing thirty
     percent (30%) or more of the combined voting power of the Company's then
     outstanding securities; or

               (IV) the shareholders of the Company approve a plan of complete
     liquidation or dissolution of the Company or there is consummated an
     agreement for the sale or disposition by the Company of all or
     substantially all of the Company's assets, other than a sale or disposition
     by the Company of all or substantially all of the Company's assets to an
     entity, at least fifty-one percent (51%) of the combined voting power of
     the voting securities of which are owned by shareholders of the Company in
     substantially the same proportions as their ownership of the Company
     immediately prior to such sale.

     Notwithstanding the foregoing, a Change in Control shall not be deemed to
     have occurred by virtue of the consummation of any transaction or series of
     integrated transactions

                                       6

<PAGE>

     immediately following which the record holders of the common stock of the
     Company immediately prior to such transaction or series of transactions
     continue to have substantially the same proportionate ownership in an
     entity which owns all or substantially all of the assets of the Company
     immediately following such transaction or series of transactions.

          "Beneficial Owner" shall have the meaning set forth in Rule 13d-3
     under the Exchange Act.

          "Exchange Act" shall mean the Securities and Exchange Act of 1934, as
     amended from time to time.

          "Person" shall have the meaning given in Section 3(a)(9) of the
     Exchange Act, as modified and used in Sections 13(d) and 14(d) thereof,
     except that such term shall not include (i) the Company or any of its
     subsidiaries, (ii) a trustee or other fiduciary holding securities under an
     employee benefit plan of the Company or any of its Affiliates, (iii) an
     underwriter temporarily holding securities pursuant to an offering of such
     securities, or (iv) a corporation owned, directly or indirectly, by the
     shareholders of the Company in substantially the same proportions as their
     ownership of stock of the Company, or (v) any individual or entity
     [including the trustees (in such capacity) of any such entity which is a
     trust] which is, directly or indirectly, the Beneficial Owner of securities
     of the Company representing five percent (5%) or more of the combined
     voting power of the Company's then outstanding securities immediately
     before the Amendment Effective Date or any Affiliate of any such individual
     or entity, including, for purposes of this Plan, any of the following: (A)
     any trust (including the trustees thereof in such capacity) established by
     or for the benefit of any such individual; (B) any charitable foundation
     (whether a trust or a

                                       7

<PAGE>

     corporation, including the trustees or directors thereof in such capacity)
     established by any such individual; (C) any spouse of any such individual;
     (D) the ancestors (and spouses) and lineal descendants (and spouses) of
     such individual and such spouse; (E) the brothers and sisters (whether by
     the whole or half blood or by adoption) of either such individual or such
     spouse; or (F) the lineal descendants (and their spouses) of such brothers
     and sisters.

          1.7 "Claimant" has the meaning given it in Section 7.2 hereof.

          1.8 "Code" means the Internal Revenue Code of 1986, as amended from
time to time.

          1.9 "Code Limitations" means the limitation of Code Section 401(a)(17)
restricting the contributions of a Participant or the Company under the
provisions of the Retirement Savings Plan.

          1.10 "Company" means Mine Safety Appliances Company, a Pennsylvania
corporation, and, except in determining under Section 1.5 hereof whether or not
any Change in Control of the Company has occurred, any successor thereto. For
purposes of this Plan (except in determining under Section 1.5 hereof whether or
not any Change in Control of the Company has occurred), any subsidiary or
affiliate of Mine Safety Appliances Company whose employees participate in the
Retirement Savings Plan shall be included within the definition of "Company."

          1.11 "Compensation" means the compensation of a Participant as defined
in the Retirement Savings Plan for purposes of calculating Employee
Contributions, but without regard to the limit on such compensation otherwise
required by Code Section 401(a)(17).

                                       8

<PAGE>

          1.12 "Deferral Election" means a "salary reduction agreement" or
"bonus deferral agreement" between an Eligible Employee and the Company, as
described in Sections 3.1 and 3.2 hereof.

          1.13 "Distribution Election" means the election to receive benefits
under the Plan in an alternative form as provided in Section 6.2 of the Plan.
The election must be in writing in the form provided in Appendix B to the Plan
and delivered to the Administrator.

          1.14 "Eligible Employee" means an Employee who participates in the
Retirement Savings Plan and whose Employee Contributions, and/or any Company
Matching Contributions with respect thereto, are restricted by the application
of a Code Limitation, and also includes other Employees as designated by the
Administrator as eligible to participate in the Plan and who are members of a
select group of management or highly compensated employees.

          1.15 "Investment Funds" means the separate investment vehicles
designated by the Administrator in which the amounts in a Participant's
Supplemental Account can be deemed invested, at the election of the Participant
in accordance with Article IV hereof.

          1.16 "Participant" means an individual who, as an Eligible Employee,
participated in the Plan prior to the Amendment Effective Date and/or files a
Deferral Election with respect to Compensation in accordance with Section 3.1 or
3.2 hereof. An individual who becomes a Participant continues to be a
Participant until the entire amount of his benefit hereunder has been
distributed.

          1.17 "Payment Date" means the date selected by the Participant for the
commencement of all or a portion of the Participant's benefits under the Plan.
The Payment Date may be either the Participant's termination date or a specified
date selected by the Participant. The specified date may be a date during which
the Participant is still an Employee,

                                       9

<PAGE>

or may be a date subsequent to the Employee's retirement. If the date is during
the time the Participant is still an employee, the distributions shall be based
on the value of the Employee's Supplemental Account as of the specified Payment
Date and shall not affect the allocation of future amounts to the Participant's
Supplemental Account. The election to receive benefits on a Payment Date shall
be in writing and submitted to the Administrator in the form provided in
Appendix A to the Plan.

          1.18 "Plan" means this MSA Supplemental Savings Plan as in effect from
time to time.

          1.19 "Retirement Savings Plan" means the MSA Retirement Savings Plan
as in effect from time to time.

          1.20 "Supplemental Account" means the unfunded bookkeeping accounts
established and maintained in accordance with Article III hereof to record the
contributions deemed to be made by the Participant and the Company for each
year, as well as the earnings, gains and losses thereon, expenses allocable
thereto, distributions therefrom and other reductions in value thereof. The
Supplemental Accounts for each year shall be comprised of two bookkeeping
sub-accounts, the Supplemental Employee Contributions Account and the
Supplemental Company Matching Contributions Account, as described in Article III
hereof.

          1.21 "Unforeseeable Emergency" means a severe financial hardship to
the Participant resulting from a sudden and unexpected illness or accident of
the Participant or of a dependent of the Participant, loss of the Participant's
property due to casualty, or other similar extraordinary and unforeseeable
circumstances arising as a result of events beyond the control of the
Participant.

                                       10

<PAGE>

          1.22 "Valuation Date" means every business day.

                                   ARTICLE II

                                  PARTICIPATION

          2.1 An Eligible Employee who is a Participant in this Plan immediately
prior to the Amendment Effective Date shall continue to be a Participant as of
the Amendment Effective Date. Any other Eligible Employee who files a Deferral
Election in accordance with Section 3.1 or 3.2 hereof shall become a Participant
in this Plan as of the date provided in such Deferral Election (unless already a
Participant herein).

                                   ARTICLE III

                            THE SUPPLEMENTAL ACCOUNT

          3.1 Deferral Election and Supplemental Employee Contributions.

          (a) Excess Salary Reduction Agreement. An Eligible Employee may elect
to execute salary reduction agreement with the Company (a "Deferral Election")
to defer a portion of his Compensation in excess of the Code Limitation during a
stated deferral period by a specified percentage not exceeding eight percent
(8%) (hereafter in this Article III, the "Elected Percentage") and to credit
such net reduction as Supplemental Employee Contributions to the Supplemental
Employee Contributions Account portion of the Supplemental Account of the
Eligible Employee.

          (b) Salary Reduction Agreement. An Eligible Employee may also elect to
execute a Deferral Election with the Company to defer an additional portion of
his Compensation during a stated deferral period and to credit such net
reduction as Supplemental Employee

                                       11

<PAGE>

Contributions to the Supplemental Employee Contributions Account portion of the
Supplemental Account of the Eligible Employee.

          (c) Salary Deferral Elections. The Salary Deferral Elections set forth
in paragraphs (a) and (b) above must be filed with the Administrator before the
beginning of the relevant deferral period. The timely-filed Deferral Election
shall become effective on the first day of the deferral period set forth in such
Deferral Election, which deferral period (except as provided in Section 3.2
hereof) shall be a complete calendar year. Such Deferral Election shall be
effective to defer Compensation relating to the Participant's services performed
in such calendar year. A Deferral Election with respect to Compensation during a
calendar year cannot be altered or revoked during that calendar year and must be
made each calendar year. Amounts credited to the Participant's Supplemental
Employee Contributions Account prior to the effective date of any new Deferral
Election will not be affected.

          (d) Bonus Deferrals. An Eligible Employee may elect to execute a
Deferral Election with the Company under which the Employee agrees to reduce his
Bonus from the Company by a stated percentage or dollar amount, and to credit
such reduction as Supplemental Employee Contributions to the Supplemental
Employee Contributions Account portion of the Supplemental Account of the
Eligible Employee. This Deferral Election shall be irrevocable with respect to
any and all Bonuses declared during a calendar year and must be filed with the
Administrator before the earlier of December 31, of the year in which the Bonus
is based, or the date the Bonus is both ascertainable and allocated to the
credit of the Eligible Employee. The minimum amount of deferral for a calendar
year shall be the lesser of $5,000 or 5% of the annual Bonus award. The deferral
of a Bonus under this paragraph (d) shall apply after the deferral on such
amount, if any under paragraphs (a) and (b) above.

                                       12

<PAGE>

          3.2 Some Mid-Year Elections Permitted. In the first calendar year in
which an Employee becomes an Eligible Employee (or (i) in the calendar year in
which a former Employee who has returned to the Company's employ becomes an
Eligible Employee (whether or not he was an Eligible Employee during a previous
period of employment) or (ii) in the calendar year in which a former Eligible
Employee who continued as an Employee (but ceased to be an Eligible Employee and
no longer has a Deferral Election in effect) again becomes an Eligible
Employee), he may make and file a Deferral Election within thirty days after he
becomes an Eligible Employee as to Compensation for services performed during
such calendar year subsequent to filing the Deferral Election.

          3.3 Supplemental Company Matching Contributions. The Employer shall
credit as Supplemental Company Matching Contributions to the Supplemental
Company Matching Contributions Account portion of the Supplemental Account of
each Participant who has Supplemental Employee Contributions credited to his
Supplemental Account pursuant to a salary reduction agreement for a calendar
year Supplemental Company Matching Contributions with respect to such calendar
year equal to fifty percent (50%) of the result of subtracting the aggregate
amount of Company Matching Contributions credited to the Participant's account
under the Retirement Savings Plan with respect to such calendar year from the
lesser of the Elected Percentage of salary reduced pursuant to a salary
reduction agreement or eight percent (8%) of Compensation. There shall be no
Matching Contributions made with respect to a Bonus deferral election pursuant
to Section 3.1(b) of this Plan.

          3.4 Earnings and Expenses for a Supplemental Account. All Supplemental
Employee Contributions and Supplemental Company Matching Contributions credited
to a Participant's Supplemental Account shall be treated as though invested and
reinvested only in

                                       13

<PAGE>

Investment Funds selected (or deemed selected) by such Participant pursuant to
Article IV hereof. A pro-rata portion of all dividends, interest gains and
distributions of any nature earned in a given period in respect of an Investment
Fund in which the Supplemental Account is treated as investing shall be credited
to the Supplemental Account, such credit to be calculated by multiplying all
such dividends, interest gains and distributions by a fraction, the numerator of
which is equal to the portion of the Supplemental Account of each Participant
that is deemed invested in the particular Investment Fund and the denominator of
which is equal to the aggregate of all amounts invested in the same Investment
Fund. All investment income deemed received from an Investment Fund shall be
deemed reinvested in the same Investment Fund. Expenses attributable to the
acquisition of investments shall be charged to the Supplemental Account (and
respective sub-accounts thereof) of the Participant for which such investment is
deemed made.

          3.5 Recordkeeping. The dollar amounts of any such Employee
Contributions and Company Matching Contributions for a Participant for each
payroll period shall be credited promptly upon the completion of such payroll
period to the appropriate sub-account of the Participant's Supplemental Account
(an unfunded bookkeeping account). The sum of the balance of a Participant's
Supplemental Employee Contributions Account and the vested balance of a
Participant's Supplemental Company Matching Contribution Account, as such sum
varies from time to time, shall be recorded on the financial books and records
of the Company as a liability owed to the Participant. The Administrator or its
delegate shall maintain such bookkeeping accounts as it deems necessary to
administer this Plan and shall calculate, or direct the calculation of, amounts
in the Participants' Supplemental Accounts. The Administrator's determination of
the value of Participants' Supplemental Accounts shall be final and binding

                                       14

<PAGE>

upon all Participants and on the Company. Participants will be furnished
statements of their Supplemental Account values at least quarter-annually.

                                   ARTICLE IV

                       PARTICIPANT-DIRECTION OF INVESTMENT

          4.1 Participant-Directed Investment. Subject to Section 4.5 hereof, a
Participant may make elections as to the deemed investment of his Supplemental
Account in accordance with such procedures as are established and uniformly
applied by the Administrator or its delegate. The Administrator or its delegate
shall provide each Participant with a description of the Investment Funds
available for selection from time to time and such other relevant information
about the Investment Funds as it receives from time to time. The Participant's
investment election shall remain in force until revised by means of a subsequent
investment election becoming effective pursuant to Section 4.2 hereof. During
any period in which the Participant does not have an investment election in
force, the Participant shall be deemed to have elected an investment in the
Retirement Government Money Market Portfolio (or any substantially similar
approved Investment Fund which has been substituted therefor) until another
investment election subsequently becomes effective pursuant to Section 4.2
hereof.

          4.2 Changes in Investment Direction and Transfers. Subject to Section
4.5 hereof, on any business day a Participant may elect to change his deemed
investment election as to subsequent contributions or to transfer amounts among
one or more of the Investment Funds then available by following notice
procedures established and uniformly applied by the Administrator or its
delegate. The Participant's notice of change or transfer shall be effective as
soon as reasonably practicable (as determined by the Administrator in its sole
discretion) after the Administrator or its delegate has received such notice.

                                       15

<PAGE>

          4.3 Responsibility for Investment Elections. The selection of
investment choices among the Investment Funds available from time to time shall
be the sole responsibility of each Participant. The deemed investment return (or
loss) with respect to a Participant's Supplemental Account shall be determined
solely by the Participant's investment elections made in accordance with this
Supplemental Plan and the procedures established and uniformly applied by the
Administrator or its delegate. The availability of an Investment Fund to a
Participant shall not be construed as a recommendation for investment therein.
Further, neither the Company, any Participating Affiliate, the Administrator or
its delegate, any Employee nor the trustee of any trust which may be established
by the Company in accordance with Section 7.3 hereof is authorized to make any
recommendation to any Participant with respect to the selection of investments
among the Investment Funds.

          4.4 Participant's Risk. Each Participant assumes all risk connected
with any decrease in the market value of any of his Supplemental Account's
deemed investments. The value of the Participant's Supplemental Account and the
payment of any amount which may be or become due therefrom are not guaranteed by
any one or any entity.

          4.5 Investment Restrictions, Temporary Suspensions of Plan Activities
and Investment Fund Transfers by Administrator. The provisions of this Section
4.5 shall apply notwithstanding any other provision of any other Section of this
Plan to the contrary. In accordance with its established and uniformly applied
procedures, the Administrator or its delegate may place certain restrictions or
limitations on the dollar amounts, percentages or types of investment elections,
transfers and/or allocations which are deemed made under the Plan. If the
Administrator changes the Plan's recordkeeper, the Administrator may temporarily
suspend certain Plan activities (including without limitation, distributions,
contribution percentage

                                       16

<PAGE>

changes and investment allocations) in order to facilitate the recordkeeping
change. If an Investment Fund is eliminated by the Administrator or its
delegate, then the Administrator or its delegate may direct that amounts deemed
invested in the Investment Fund which was eliminated shall be automatically
transferred to another Investment Fund with similar investment goals. After any
such transfer by the Administrator or its delegate, further investment changes
may be made by the Participant in accordance with Section 4.2 hereof.
Notwithstanding the foregoing provisions of this Section 4.5, no power given the
Administrator or its delegate in this Section 4.5 can be used after a Change in
Control to reduce or adversely affect in any way any benefit payable to, or
accrued by, a Participant (or his Beneficiary) hereunder.

                                    ARTICLE V

                                     VESTING

          5.1 Vesting in Supplemental Employee Contributions Account. A
Participant's unfunded and unsecured interest in his Supplemental Employee
Contributions Account shall be 100% vested at all times.

          5.2 Vesting in Supplemental Company Contributions Account. A
Participant's unfunded and unsecured interest in his Supplemental Company
Matching Contributions Account shall become 100% vested upon the earliest of the
following to occur:

                    (i)  Participant's completion of five (5) years of
                         Continuous Service;

                    (ii) Death of the Participant while employed by the Company;

                    (iii)Attainment of the Participant's 65th birthday while
                         employed by the Company; or

                                       17

<PAGE>

                    (iv) Occurrence of a Change in Control while the Participant
                         is employed by the Company.

          5.3 Forfeitures. If a Participant terminates his employment, any
portion of his Supplemental Account (including any amounts credited after his
termination of employment) which is not payable to him under Article VI hereof
shall be forfeited by him upon such termination.

                                   ARTICLE VI

                            DISTRIBUTION OF BENEFITS

          6.1 Time of Distribution. The vested amount held in a Participant's
Supplemental Account hereunder shall become payable to him commencing on the
Participant's Payment Date. A Participant shall select a Payment Date at any
time and may make a separate election with respect to each year of deferrals,
however, such election shall not be valid until the one-year anniversary after
it is made. Accordingly, if a Participant elects a Payment Date but then
terminates employment prior to the one-year anniversary date, the election will
be void and distributions will commence as of the Participant's termination
date. Under no circumstance, however, may the commencement of benefits be
delayed beyond the later of 90 days after the Participant's termination date or
the first day of April of the year following the calendar year in which the
Participant attains age 70 1/2

          6.2 Form of Distribution. If the value of the Participant's vested
Supplemental Account is less than $25,000, cash payment shall be made in a
single lump sum. If the value of the Participant's vested Supplemental Account
is $25,000 or more, cash payment will be made in five (5) approximately equal
annual installments, each installment calculated by dividing the

                                       18

<PAGE>

then-current value of the Participant's vested Supplemental Account by the
number of remaining installment payments. Alternatively, a Participant may make
an irrevocable Distribution Election to receive the entire vested balance of his
Supplemental Account in either a single cash payment or any number of annual or
monthly installments, each installment calculated by dividing then current value
of the Participant's vested Supplemental Account by the number of remaining
installment payments. A Participant may elect a Distribution Election at any
time and may make a separate election with respect to each year of deferrals,
however, such election shall not be valid until the one-year anniversary after
it is made. Accordingly, if a Participant makes a Distribution Election but then
terminates employment prior to the one-year anniversary date, the election will
be void and distributions will commence under either the previously made
election, if any, or if there is no previously made election under the general
five installment rule set forth above. Notwithstanding the foregoing provisions
of this Section 6.2, if the employment of a Participant shall be terminated
within the three-year period immediately following a Change in Control (other
than by the Participant's death), the entire balance of his Supplemental Account
shall be paid to him in a single cash payment, not later than the fifth (5th)
business day following such termination.

          6.3 Hardship Distributions. A Participant may receive a distribution
of all or a portion of his vested Supplemental Account in the event of an
Unforeseeable Emergency in the discretion of the Administrator. The amount
provided as a hardship distribution must be limited to the amount necessary to
meet the need. Any such hardship distribution shall not have any affect on the
allocation of future amounts to the Participant's Supplemental Account.

          6.4 Distribution on Death. In the event of a Participant's death
hereunder, the then current value of his Supplemental Account shall be paid to
his Beneficiary in either a lump

                                       19

<PAGE>

sum cash payment or annual installment payments for a period not to exceed 15
years as determined in the discretion of the Administrator.

          6.5 Valuation of Supplemental Account. A Participant's Account shall
be valued for distribution purposes as of the date of distribution.

                                   ARTICLE VII

                               GENERAL PROVISIONS

          7.1 Administration. The responsibility to administer this Plan and to
interpret and carry out its provisions is hereby delegated to the Administrator.
The Administrator is hereby authorized to delegate any part or all of its duties
to such other administrators as it may appoint. The Administrator (or its
delegate) shall have the same rights, powers, duties and fiduciary obligations,
and operate with the same standard of care, with respect to this Plan and its
Participants as the Retirement Savings Plan Committee has and does with respect
to the Retirement Savings Plan and its participants.

          7.2 Benefit Review Procedure. The Administrator shall initially make
all determinations of eligibility for and the amount of benefits payable to a
Participant or his Beneficiary (hereafter referred to as the "Claimant"). If the
Administrator makes a decision which is adverse to the interests of any
Claimant, the Administrator shall furnish notice of the adverse decision to the
Claimant specifying the reason for the denial. The Claimant shall have the right
to request a redetermination of such decision by the Administrator within sixty
(60) days of receipt of the written notice of claim denial. The Employee Benefit
Plan Committee appointed by the Board shall promptly review the request for
redetermination, and within sixty (60) days submit its final decision to the
Claimant in writing.

                                       20

<PAGE>

          7.3 No Right to Assets. Any Participant (or Participant's beneficiary)
who may have or claim any interest in or right to any compensation, payment or
benefit payable hereunder shall rely solely upon the unsecured promise of the
Company as set forth herein for the payment thereof and shall have the status of
a general unsecured creditor of the Company. The Plan constitutes a mere promise
by the Company to make certain benefit payments in the future. The right of any
Participant or beneficiary to benefits hereunder is strictly contractual.
Notwithstanding the foregoing provisions of this Article VII, Mine Safety
Appliances Company may, in its discretion, establish a trust to pay amounts
becoming payable by the Company pursuant to this Plan, which trust shall be
subject to the claims of the general creditors of Mine Safety Appliances Company
in the event of its bankruptcy or insolvency. Notwithstanding any establishment
of such a trust, the Company shall remain responsible for the payment of any
amounts so payable which are not so paid by such trust. If any such trust is
established, the trustee will not be required to invest trust assets in
accordance with the directions of Participants given in accordance with this
Plan, although the trustee, in its discretion, may so invest the trust assets.
Notwithstanding any provision of this Plan, all "investment powers" given to any
Participant over his Supplemental Account are actually powers to direct a deemed
investment of such Supplemental Account, thus determining the investment return
on the contributions deemed made to such Supplemental Account and the amount of
the benefit the Company must pay the Participant with respect to such
Supplemental Account. It is intended that this Plan shall be unfunded for
Federal income tax purposes and for purposes of Title I of ERISA. It is intended
that any trust established in accordance with this Section 7.3 shall be treated
as a grantor trust under the Code and that the establishment of such a trust
shall not cause Participants to realize current income on amounts contributed
thereto.

                                       21

<PAGE>

          7.4 No Contract of Employment. This Plan shall not be construed to
establish a guarantee of future or continued employment by the Company of any
Participant.

          7.5 Non-Alienation. Benefits payable under this Plan shall not be
subject in any manner to anticipation, alienation, sale, transfer, assignment,
pledge, encumbrance, attachment or garnishment, whether voluntary or
involuntary, and any attempt to anticipate, alienate, sell, transfer, assign,
pledge, encumber, attach or garnish the same shall be void; nor shall any such
distribution or payment be in any way liable for or subject to the debts,
contracts, liabilities, engagements or torts of any person entitled to such
distribution or payment. If any Participant or Beneficiary is adjudicated
bankrupt or purports to anticipate, alienate, sell, transfer, assign, pledge,
encumber, attach or garnish any such distribution or payment voluntarily or
involuntarily, the Administrator, in its discretion, may hold or cause to be
held or applied such distribution or payment or any part thereof to or for the
benefit of such Participant or Beneficiary in such manner as the Administrator
shall direct.

          7.6 Payments to Minors or Incompetents. If the Administrator
determines that any person entitled to payments under the Plan is an infant or
incompetent by reason of physical or mental disability, it may cause all
payments thereafter becoming due to such person to be made to any other person
for his benefit, without responsibility to follow the application of amounts so
paid. Payments made pursuant to this provision shall completely discharge the
Company, the Plan, and the Administrator.

          7.7 Construction: Choice of Laws. The provisions of the Plan shall be
construed, administered and governed under the laws of the Commonwealth of
Pennsylvania to the extent such laws are not preempted by ERISA or any other
federal laws which may from time to time be applicable. Whenever any words are
used herein in the masculine gender, they

                                       22

<PAGE>

shall be construed as though they were also used in the feminine gender in all
cases where they would so apply, and whenever any words are used herein in the
singular form, they shall be construed as though they were also used in the
plural form in all cases where they would so apply. Titles of Articles and
Sections hereof are for convenience of reference only and are not to be taken
into account in construing the provisions of this Plan.

          7.8 Invalidity of Provisions. If any provision of the Plan shall be
held illegal or invalid for any reason, said illegality or invalidity shall not
affect the remaining parts of the Plan, but the Plan shall be construed and
enforced as if said illegal and invalid provision had never been inserted
herein.

          7.9 Amendment and Termination. The Company expects to continue the
Plan indefinitely, but specifically reserves the right, in the sole and
unfettered discretion of its Board, at any time, to amend, in whole or in part,
any or all of the provisions of the Plan and to terminate the Plan in whole or
in part, provided, however, that no such amendment or termination shall (i)
reduce or adversely affect the benefits payable under the Plan to a Participant
(or his Beneficiary) if the Participant's termination of employment with the
Company has occurred prior to such termination or amendment of the Plan, or (ii)
reduce or adversely affect the benefit to be paid with respect to the
Participant on the date of such termination or amendment, as compared with the
benefit that would have been payable with respect to the Participant if his
employment had terminated on the day before the Plan was so terminated or
amended. Upon a termination of the Plan, no further Supplemental Employee
Contributions or Supplemental Company Matching Contributions shall be made under
the Plan, but the Supplemental Accounts maintained under the Plan at the time of
such Plan Termination shall continue to be governed by the terms of the Plan
until paid out in accordance with such terms.

                                       23

<PAGE>

                                   APPENDIX A

                         MSA SUPPLEMENTAL SAVINGS PLAN

                             SPECIFIED PAYMENT DATE

     I,                                    hereby elect to have [ ]$     [ ]   %
        ----------------------------------                                  ---
of my vested Supplemental Account paid upon the earlier of my termination of
employment or the following date:                                  .
                                 ----------------------------------

     I understand that this election shall not be valid until the one-year
anniversary date of this election. I also understand that this election shall be
irrevocable and that by making this election, I am also electing to receive the
above benefits in the form of a single cash sum.

     I have made this election on this       day of                , 2     .
                                      ------       ----------------- -------

WITNESS:                                                   PARTICIPANT:

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

Approved by Administrator:

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

Date:

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

<PAGE>

                                   APPENDIX B

                          MSA SUPPLEMENTAL SAVINGS PLAN

                              DISTRIBUTION ELECTION

     I,                                     hereby elect to have my benefits
       ------------------------------------
under the MSA Supplemental Savings Plan paid in the following form:

                     [ ]  A single cash sum payment.

                     [ ]  15 Approximately equal annual installments.

     I understand that this election shall not be valid until the one-year
anniversary date of this election. I also understand that this election shall be
irrevocable.

     I have made this election on this       day of                      , 2   .
                                      -------      -----------------------  ---

WITNESS:                                                   PARTICIPANT:

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

Approved by Administrator:

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

Date:

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