Document:

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                                                                   Exhibit 10(d)

                         MINE SAFETY APPLIANCES COMPANY
                            SUPPLEMENTAL PENSION PLAN
                                   MAY 5, 1998

                                    SECTION I
                                    ---------

                                     PURPOSE
                                     -------

          I.1   Purpose. The purpose of the Mine Safety Appliances Company
Supplemental Pension Plan, as originally adopted on April 24, 1984, is to
provide certain employees of Mine Safety Appliances Company with additional
retirement income by supplementing the pension benefit provided to such
employees under the Non-Contributory Pension Plan for Employees of Mine Safety
Appliances Company (the "Pension Plan") to the extent benefits payable
thereunder are limited by Section 415 of the Internal Revenue Code of 1986, as
amended from time to time (the "Code"). The purposes of this plan instrument are
(i) to memorialize in writing the existing supplemental pension plan of Mine
Safety Appliances Company, (ii) to provide an additional supplement to pension
benefits under the Pension Plan to the extent that they are limited by Section
401(a)(17) of the Code, and (iii) to provide certain Change-in-Control
protection of the supplemental benefits provided hereunder.

                                   SECTION II
                                   ----------

                                   DEFINITIONS
                                   -----------

          II.1  Definitions. The following definitions shall apply for purposes
of the Plan, unless a different meaning is plainly indicated by the context:

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

                (b) Board shall mean the Board of Directors of the Company, as
constituted from time to time.

                (c) Change in Control shall be deemed to have occurred if the
event set forth in any one of the following paragraphs shall have occurred:

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                    (I)   any Person is or becomes the Beneficial Owner,
          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)) 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 5, 1998, 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 5, 1998 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 voting securities of the Company outstanding
          immediately prior to such merger or consolidation continuing to
          represent (either by remaining outstanding or by being con-

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          verted 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 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.

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                (d) Code shall mean the Internal Revenue Code of 1986, as
amended from time to time.

                (e) Committee shall mean the Compensation Committee of the
Board.

                (f) Company shall mean Mine Safety Appliances Company and
(except as used in the definitions of Change in Control and Person in this
Section II) any successor to all or a major portion of its assets or business,
which successor assumes the obligations of the Company under this Plan by
operation of law or otherwise.

                (g) ERISA shall mean the Employee Retirement Income Security Act
of 1974, as from time to time amended.

                (h) Exchange Act shall mean the Securities Exchange Act of 1934,
as amended from time to time.

                (i) Participant shall mean an employee of the Company or a
Participating Affiliate (i) who is designated by the Board for participation
herein, and (ii) who participates in the Pension Plan and whose hypothetical
benefits under the Pension Plan determined on the basis of the provisions of the
Pension Plan without regard to the limitations of Sections 401(a)(17)and 415 of
the Code would exceed the actual benefits payable under the Pension Plan taking
into account such limitations.

                (j) Participating Affiliate shall have the meaning given such
term in the Pension Plan.

                (k) Pension Plan shall mean the Non-Contributory Pension Plan
for Employees of Mine Safety Appliances Company, as it may be amended from time
to time.

                (l) 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

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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 date hereof
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 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.

                (m) Plan shall mean The Mine Safety Appliances Company
Supplemental Pension Plan, as set forth in this plan instrument, as it may be
amended from time to time.

                (n) Supplemental Retirement Benefit shall have the meaning set
forth in Section 3.1 hereof.

                                   SECTION III
                                   -----------

                                    BENEFITS
                                    --------

          III.1 Supplemental Retirement Benefit. Each Participant (or his or her
joint annuitant or designated survivor or beneficiary) shall be entitled under
this

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Plan to receive a Supplemental Retirement Benefit equal to the difference
between (i) the benefits (if any) that would have been payable to such
individual under the Pension Plan if the limitations on benefits imposed on the
Pension Plan by Section 415 of the Code (and by Section 401(a)(17) of the Code
as to any such individual who is an employee of the Company or a Participating
Affiliate on May 5, 1998 or becomes such an employee at any time after May 5,
1998) were not imposed, and (ii) the benefits (if any) actually payable to such
individual under the Pension Plan.

                Subject to Section 3.3 hereof, the benefits under this Plan
shall be payable at the same time or times and in the same manner as such
benefits are payable under the Pension Plan, and any election of an optional
form of payment, or designation of a survivor or beneficiary that is effective
under the Pension Plan shall also apply to the benefits payable under this Plan.

          III.2 Vesting. A Participant shall be vested in his or her
Supplemental Retirement Benefit only if vested in his or her benefit under the
Pension Plan.

          III.3 Effect of Change in Control. Notwithstanding any other provision
of this Plan, if a Participant is vested in his or her Supplemental Retirement
Benefit on the date of the Participant's termination of employment and that
termination date occurs on, or within the three-year period immediately
following, a Change in Control, then, not later than the fifth (5/th/) business
day following such termination date, the Company shall pay the Participant a
lump sum amount equal to the actuarial equivalent of the Participant's
Supplemental Retirement Benefit (in lieu of making payment of such Supplemental
Retirement Benefit in accordance with Section 3.1 hereof). For purposes of this
Section 3.3, "actuarial equivalent" shall be determined using the same
assumptions utilized under the Pension Plan immediately prior to the
Participant's termination date, or, if more favorable to the Participant,
immediately prior to the Change in Control.

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                                   SECTION IV
                                   ----------

                                 ADMINISTRATION
                                 --------------

          IV.1  Administration. The Plan shall be administered by the Committee.

          IV.2  Duties. The Committee shall perform the duties required, and
shall have the powers necessary, to administer the Plan and carry out the
provisions thereof.

          IV.3  Powers. The powers of the Committee shall be as follows:

                    (a)  To determine any question arising in connection with
                the Plan (and its decision or action in respect thereof shall be
                final, conclusive and binding upon the Company and the
                Participants and any other individual interested herein);

                    (b)  To engage the services of counsel or attorney (who may
                be counsel or attorney for the Company) and an actuary, if it
                deems necessary, and such other agents or assistants as it deems
                advisable for the proper administration of the Plan; and

                    (c)  To receive from the Company and from Participants such
                information as shall be necessary for the proper administration
                of the Plan.

          IV.4  Claims Procedure. Subject to the provisions of this Plan, the
Committee shall make all determinations as to the right of any individual to a
benefit. Any denial by the Committee of the claim for benefits under the Plan by
a Participant or any other individual interested herein shall be stated in
writing by the Committee and delivered or mailed to the Participant or such
individual. Such notice shall set forth the specific reasons for the denial,
written to the best of the Committee's ability in a manner that may be
understood without legal or actuarial counsel. In addi-

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tion, the Committee shall afford to any Participant (or his or her joint
annuitant, designated survivor or beneficiary) whose claim for benefits has been
denied a reasonable opportunity for a review of the decision denying the claim.

                                    SECTION V
                                    ---------

                            NONALIENATION OF BENEFITS
                            -------------------------

          Neither the Participant nor any other individual shall have any right
to assign or otherwise to alienate the right to receive payments under the Plan,
in whole or in part. The immediately preceding sentence shall not apply to any
benefit payable pursuant to a "qualified domestic relations order," as defined
in Section 414(p) of the Code, which the Committee determines is applicable to
any benefit hereunder.

                                   SECTION VI
                                   ----------

                            AMENDMENT AND TERMINATION
                            -------------------------

          The Company reserves the right at any time by action of the Board to
terminate the Plan or to amend its provisions in any way. Notwithstanding the
foregoing, no termination or amendment of the Plan may (i) reduce the benefits
payable under the Plan to the Participant (or his or her joint annuitant or
designated survivor or beneficiary) if the Participant's termination of
employment with the Company (and Participating Affiliates, if applicable) has
occurred prior to such termination of the Plan or amendment of its provisions,
or (ii) reduce the benefit to be paid with respect to the Participant on the
date of such termination of the Plan or amendment of its provisions below the
amount that would have been paid with respect to the Participant if his or her
employment had terminated on the day before such termination or amendment.

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                                   SECTION VII
                                   -----------

                                  MISCELLANEOUS
                                  -------------

          VII.1 No Right to Employment. This Plan shall not be construed as
providing any Participant with the right to be retained in the Company's employ
(or the employ of any Participating Affiliate) or to receive any benefit not
specifically provided hereunder.

          VII.2 No Effect on Other Compensation and Benefits. Nothing contained
herein shall exclude or in any manner modify or otherwise affect any existing or
future rights of any Participant to participate in and receive the benefits of
any compensation, bonus, pension, life insurance, medical and hospitalization
insurance or other employee benefit plan or program to which he or she otherwise
might be or become entitled as an officer or employee of the Company (or any
Participating Affiliate).

          VII.3 No Amendment to Pension Plan. This Plan shall not be deemed to
constitute an amendment to, or a part of, the Pension Plan. All references
hereunder to the Pension Plan shall include any amended or successor plan or
plans maintained by the Company, the terms of which may be applicable at any
time to a Participant's defined benefit retirement benefit. If, however, the
Pension Plan terminates, merges with, or is replaced by a successor plan, and as
a result thereof the amount of the Supplemental Retirement Benefit to be paid to
any Participant hereunder would be reduced or calculated on a different basis,
or commence at a later date or dates, such Supplemental Retirement Benefit shall
not be less than an amount calculated pursuant to the provisions of this Plan
and in accordance with the terms of the Pension Plan, as in effect immediately
prior to such termination, merger or replacement.

          VII.4 Governing Law. This Plan shall be construed in accordance with
and governed by the laws of the Commonwealth of Pennsylvania, without regard to
its conflicts of law principles.

          VII.5 Status. This Plan is not intended to

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satisfy the requirements for qualification under Section 401(a) of the Code. It
is intended to be a nonqualified plan that is not subject to ERISA. The Plan
shall be construed and administered so as to effectuate this intent.

          VII.6 Expenses. All expenses of establishing and administering the
Plan shall be paid by the Company. No individual interested herein shall have
any interest in any specific assets of the Company by reason of the individual's
interest under the Plan, and such individuals shall have only the status of
unsecured creditors of the Company with respect to any benefits that become
payable under this Plan.

          VII.7 Successors. The Company shall require any successor (whether
direct or indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to expressly
assume the Company's obligations hereunder in the same manner and to the same
extent that the Company would be required to perform if no such succession had
taken place.

          VII.8 Withholding Requirements. Payment of benefits under this Plan
shall be subject to applicable withholding requirements.

          IN WITNESS WHEREOF, Mine Safety Appliances Company has caused this
plan to be executed by its duly authorized officers this 5th day of May, 1998.

ATTEST:                                 MINE SAFETY APPLIANCES COMPANY

                                        By:
-----------------------------------        -------------------------------------
             Secretary                               Chairman and Chief
                                                     Executive Officer

                                       10<PAGE>

                                                                   Exhibit 10(g)

                         MINE SAFETY APPLIANCES COMPANY
                           ANNUAL INCENTIVE BONUS PLAN
                                   MAY 5, 1998

1.  Purposes.
    --------

          The purposes of the Mine Safety Appliances Company Annual Incentive
Bonus Plan are to attract and retain highly-qualified executives by providing
appropriate performance-based short-term incentive awards, to provide strong
financial incentive each year for the excellent performance of each
participating executive by making a significant percentage of the executive's
total cash compensation dependent upon the level of corporate and individual
performance attained for the year, and, by accomplishing those objectives, to
increase shareholder value.

2.  Definitions in Last Section.
    ---------------------------

          For purposes of the Plan, capitalized terms, unless defined where the
respective term first appears in the Plan, shall have the meanings given in the
last Section hereof.

3.  Eligibility.
    -----------

          With respect to any Plan Year, all Company officers and such key
employees of the Company and its Subsidiaries as are designated by the Chief
Executive Officer shall participate in the Plan.

4.  Bonuses.
    -------

          (a)   Participant's Target Bonus. The Committee shall establish the
amount of the target Bonus for each Participant with respect to each Plan Year.
A Participant's target Bonus for a particular Plan Year shall be the dollar
amount resulting from multiplying the median market level salary (represented by
the salary midpoint as of the January 1/st/ immediately following the Plan Year)
for an individual in the Participant's position by

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a percentage determined by the Committee. With respect to any Participant other
than the Chief Executive Officer, the Committee shall be assisted in determining
the applicable percentage by the recommendation of the Chief Executive Officer.
After a Participant's target Bonus has been established for a particular Plan
Year, it cannot be changed, except that, in the sole discretion of the Committee
(assisted by the recommendation of the Chief Executive Officer with respect to
any Participant other than the Chief Executive Officer), a Participant's target
Bonus can be adjusted if the Participant's position is changed during such Plan
Year (whether or not the Participant's title is changed).

          (b)   Participant's Performance Goal. For each Plan Year, the
applicable Performance Goal for each Participant shall be comprised of one or
more EBIT targets. In the case of the Chief Executive Officer, the Performance
Goal shall be the attainment of the target Consolidated EBIT. In the case of any
other Participant, the Performance Goal shall be the attainment of such EBIT
targets (including Consolidated EBIT, United States EBIT and Divisional EBIT) as
the Chief Executive Officer, in his sole discretion, shall determine to be
relevant to the Participant's performance and such EBIT targets shall be
weighted for their relevance to the Participant's performance in such manner as
the Chief Executive Officer, in his sole discretion, shall determine to be
appropriate; provided, however, that attainment of the target Consolidated EBIT
shall constitute at least 25% of the Performance Goal for each Participant who
is an officer of the Company. The Performance Goal for any such Participant may
be (but need not be) different each Plan Year and different Performance Goals
may be applicable to different Participants.

          (c)   Two-Stage Calculation of Bonus Earned by a Participant. The
calculation of the actual Bonus earned by a Participant with respect to a Plan
Year shall be done in two stages. The first stage shall be based on the degree
of attainment of the applicable Performance Goal during the relevant Plan Year
and shall calculate the tentative Bonus earned under the Plan as a percentage of
the Participant's target Bonus, which percentage shall

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vary depending upon the extent to which the Performance Goal has been attained
and may be lesser than, greater than, or equal to 100%. Notwithstanding the
immediately preceding sentence, but subject to Section 4(h) hereof, if less than
50% of an EBIT target which is a component of a Participant's Performance Goal
with respect to a particular Plan Year is achieved, no Bonus shall be paid to
the Participant with respect to that EBIT target for the Plan Year (that is, the
tentative Bonus with respect to that one weighted component of the Participant's
Performance Goal shall be zero), but any such failure to achieve 50% of that
EBIT target shall not affect the calculation of the tentative Bonus with respect
to the achievement of any other EBIT target which is also a weighted component
of the Participant's Performance Goal.

          The second stage of the calculation shall multiply the tentative Bonus
so determined by a percentage which represents a personal performance factor
(the "Personal Performance Percentage"). The Personal Performance Percentage
shall vary based on the Participant's individual performance during the Plan
Year and may be lesser than, greater than, or equal to 100% In the case of the
Chief Executive Officer, the Personal Performance Percentage shall be determined
by the Committee in its sole discretion. In the case of any other Participant,
the Personal Performance Percentage shall be determined by the Chief Executive
Officer, in his sole discretion, with the assistance of a recommendation from
the Participant's direct supervisor (if other than the Chief Executive Officer).
Notwithstanding any other provision of this Section 4(c), the Personal
Performance Percentage with respect to each Participant shall not be less than
80% nor greater than 120%, and the Bonus paid to any Participant with respect to
any Plan Year shall not exceed 150% of the Participant's target Bonus with
respect to the Plan Year.

          (d)   Maximum Aggregate Bonuses for Plan Year. The maximum amount
payable as Bonuses hereunder with respect to any Plan Year shall not exceed 3%
of Consolidated EBIT for such Plan Year.

          (e)   Committee Review and Adjustment of Calcu-

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lation. The Committee shall review the Bonuses calculated pursuant to Sections
4(c) and 4(d) hereof with respect to each Plan Year and, subject to Section 4(d)
and the last sentence of Section 4(c) hereof, the Committee may, in its sole
discretion, adjust (including increasing, reducing or eliminating) the amount of
any Bonus before making a recommendation to the Board regarding the Bonuses (if
any) to be paid with respect to the Plan Year.

          (f)   Employment Requirement for Bonus Payment and Exceptions Thereto.

                (i)   Except as provided in Sections 4(f)(ii) and 4(f)(iii)
hereof, payment of a Bonus to a particular Participant for a Plan Year shall be
made only if, and to the extent that, the foregoing requirements of this Section
4 have been met with respect to the Plan Year and only if the Participant is
employed by the Company or one of its Subsidiaries for the entire Plan Year
(from the first day of the Plan Year through the last day of the Plan Year),
except as set forth in Section 4(h) hereof.

                (ii)  If, under circumstances described in this Section 4(f)
(ii), a Participant has been employed by the Company (or one of its
Subsidiaries) for only part of a Plan Year, a pro-rata Bonus shall be paid to
the Participant. The pro-rata Bonus shall be calculated by multiplying the Bonus
which would be payable if such employment had been for the entire Plan Year by a
fraction, the numerator of which shall be the Participant's days of such
employment during the Plan Year (except as provided in Section 4(f)(ii)(E)
hereof) and the denominator of which shall be 365. The circumstances under which
such a pro-rata Bonus shall become payable with respect to a Plan Year are the
following:

                      (A)  the Participant's employment has terminated during
the Plan Year under circumstances which qualify the Participant for retirement
(including early retirement) under the Non-Contributory Pension Plan for
Employees of Mine Safety Appliances Company (or any successor plan thereto);

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                      (B)  the Participant has died during the Plan Year;

                      (C)  the Participant was newly hired by the Company or one
of its Subsidiaries during the Plan Year and remained so employed on the last
day of the Plan Year;

                      (D)  the individual (not initially a Participant) was
already employed by the Company or one of its Subsidiaries on the first day of
the Plan Year, but became a Participant later in the Plan Year in connection
with a promotion (either by designation by the Chief Executive Officer or by
promotion to a position as Company officer); and

                      (E)  the Participant was disabled (within the meaning of
the Company's long-term disability plan) during part of the Plan Year; in that
event the numerator of the fraction used to calculate the pro-rata Bonus shall
be either the days of the Plan Year during which the Participant was actively at
work or such other number (which shall not be more than 365) as is determined by
the Committee in its sole discretion.

                (iii) Subject to Section 4(d) and the last sentence of Section
4(c) hereof, the Committee, in its sole discretion, may determine that the
Company shall pay a Bonus with respect to a Plan Year (in an amount and,
notwithstanding the first two sentences of Section 4(g) hereof, at a time
determined in its sole discretion) to any Participant whose employment with the
Company or one of its Subsidiaries has terminated during the Plan Year.

          (g)   Time of Payment; Termination for Cause. As soon as practicable
after the Plan Year, the following shall be accomplished: (i) the calculation of
the Bonuses with respect to a Plan Year pursuant to Sections 4(c) and 4(d)
hereof, (ii) the Committee's review of, and recommendation to the Board with
respect to, such Bonuses pursuant to Sections 4(e) and 4(f) hereof, and (iii)
the action of the Board making a final determination (subject to Section 4(d)
and the last sentence of

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Section 4(c) hereof) as to what Bonuses (if any) shall be paid with respect to
the Plan Year. Except as provided in the two immediately following sentences and
in Section 4(h) hereof, all Bonuses to which Participants become entitled under
this Section 4 with respect to a Plan Year shall be paid in lump sum cash
payments as soon as practicable after such Board determination, but not later
than the March 15/th/ immediately following the Plan Year. Notwithstanding any
of the foregoing provisions of the Plan, if the employment of a Participant has
been terminated for cause (as determined in the sole discretion of the Committee
prior to the occurrence of any Change in Control) at any time before the Company
has paid the Participant's Bonus with respect to a Plan Year, no Bonus shall be
paid to the Participant with respect to such Plan Year. For purposes of the
Plan, after a Change in Control has occurred, the Committee shall have no power
to determine that a termination of a Participant's employment has been made for
cause.

          (h)   Change in Control. Notwithstanding any other provision of the
Plan to the contrary, (i) if a Change in Control of the Company shall occur
following a Plan Year as to which the actual Bonuses to be paid have been
determined (but such Bonuses have not yet been paid), such Bonuses shall be paid
immediately in cash, (ii) if a Change in Control shall occur following a Plan
Year as to which the actual Bonuses to be paid have not yet been determined,
such Bonuses shall be immediately determined and paid in cash, and (iii) if a
Change in Control shall occur during a Plan Year as to which target Bonuses have
been established (but the actual Bonuses to be paid have not yet been
determined), such Plan Year shall be deemed to have been completed, the target
levels of performance set forth under the respective Performance Goals shall be
deemed to have been attained, the respective Personal Performance Percentages
shall be deemed to be 100%, and a pro rata portion of the Bonus so determined
for each Participant for such partial Plan Year (based on the number of full and
partial months which have elapsed with respect to such Plan Year) shall be paid
immediately in cash to each Participant for whom a target Bonus for such Plan
Year was established.

                                       6

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5.  Administration.
    --------------

          The Plan shall be administered by the Committee. The Committee shall
have the authority in its sole discretion, subject to and not inconsistent with
the express provisions of the Plan, to administer the Plan and to exercise all
the powers and authorities either specifically granted to it under the Plan or
necessary or advisable in the administration of the Plan, including, without
limitation, to make adjustments in the Performance Goals in response to changes
in applicable laws, regulations, or accounting principles; to construe and
interpret the Plan; to prescribe, amend and rescind rules and regulations
relating to the Plan; and to make all other determinations deemed necessary or
advisable for the administration of the Plan.

          The Committee shall consist of two or more persons. The Committee may
appoint a chairperson and a secretary and may make such rules and regulations
for the conduct of its business as it shall deem advisable, and shall keep
minutes of its meetings. All determinations of the Committee shall be made by a
majority of its members either present in person or participating by conference
telephone at a meeting or by unanimous written consent. The Committee may
delegate to one or more of its members or to one or more agents such
administrative duties as it may deem advisable, and the Committee or any person
to whom it has delegated duties as aforesaid may employ one or more persons to
render advice with respect to any responsibility the Committee or such person
may have under the Plan. All decisions, determinations and interpretations of
the Committee (except those which are specifically stated herein to be subject
to Board action) shall be final and binding on all persons, including the
Company, the Participant (or any person claiming any rights under the Plan from
or through any Participant) and any shareholder.

          No member of the Board or the Committee shall be liable for any action
taken or determination made in good faith with respect to the Plan or any Bonus
hereunder.

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<PAGE>

6.  General Provisions.
    ------------------

          (a)   No Right To Continued Employment. Nothing in the Plan or in any
Bonus hereunder shall confer upon any Participant the right to continue in the
employ of the Company or any of its Subsidiaries or to be entitled to any
remuneration or benefits not set forth in the Plan or to interfere with or limit
in any way the right of the Company to terminate such Participant's employment.

          (b)   Withholding Taxes. The Company or Subsidiary employing any
Participant shall deduct from all payments under the Plan any taxes required to
be withheld by federal, state or local governments.

          (c)   Amendment and Termination of the Plan. The Board may at any time
and from time to time alter, amend, suspend, or terminate the Plan in whole or
in part. Additionally, the Committee may make such amendments as it deems
necessary to comply with other applicable laws, rules and regulations.
Notwithstanding the foregoing, no amendment, suspension or termination of the
Plan shall affect adversely any of the rights of any Participant, without such
Participant's written consent, with respect to any target Bonus theretofore
established with respect to the Participant (or any Bonus to which the
Participant has become entitled) under the Plan.

          (d)   Participant Rights. No Participant in the Plan for a particular
Plan Year shall have any claim to be granted any target Bonus under the Plan for
any subsequent Plan Year, and there is no obligation for uniformity of treatment
for Participants.

          (e)   Unfunded Status of Bonuses. The Plan is intended to constitute
an "unfunded" plan for incentive compensation. With respect to any payments
which at any time are not yet made to a Participant with respect to a Bonus,
nothing contained in the Plan or any related document shall give any such
Participant any rights that are greater than those of a general creditor of the
Company.

                                       8

<PAGE>

          (f)   Governing Law. The Plan and the rights of all persons claiming
hereunder shall be construed and determined in accordance with the laws of the
Commonwealth of Pennsylvania without giving effect to the choice of law
principles thereof, except to the extent that such law is preempted by federal
law.

          (g)   Effective Date. This Plan memorializes in writing the existing
annual bonus policy of the Company, while adding certain Change-in-Control
protection with respect to the Bonuses provided under the Plan; therefore, upon
approval by the Board during the 1998 Plan Year, the Plan (with such added
protection) shall take effect as of January 1, 1998 (the "effective date").

7.  Definitions.
    -----------

          The following terms, as used herein, shall have the following
meanings:

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

    (b)   "Board" shall mean the Board of Directors of the Company.

    (c)   "Bonus" shall mean any annual incentive bonus to which a Participant
          becomes entitled pursuant to the Plan; the establishment of a "target
          Bonus" with respect to a Participant pursuant to Section 4(a) hereof
          does not, by itself, entitle the Participant to payment of any Bonus
          hereunder; a Bonus must be earned and become payable pursuant to other
          provisions hereof.

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

                    (I)   any Person is or becomes the Beneficial Owner,
          directly or indirectly, of

                                       9

<PAGE>

          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)) 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 the effective date hereof, 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 the effective date hereof 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 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

                                       10

<PAGE>

          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 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.

                                       11

<PAGE>

    (e)   "Chief Executive Officer" shall mean the Chief Executive Officer of
          the Company.

    (f)   "Code" shall mean the Internal Revenue Code of 1986, as amended from
          time to time.

    (g)   "Committee" shall mean the Compensation Committee of the Board.

    (h)  "Company" shall mean Mine Safety Appliances Company, a corporation
          organized under the laws of the Commonwealth of Pennsylvania, or
          (except as used in the definitions of Change in Control and Person in
          this Section 7) any successor corporation.

    (i)   "EBIT" shall mean "earnings before interest and taxes". The Committee
          shall establish target EBITs (and the formula and method(s) for
          calculating EBIT amounts) for each Plan Year with respect to the
          Company's consolidated worldwide operations ("Consolidated EBIT") and
          the Company's United States operations ("United States EBIT"), and the
          Chief Executive Officer shall establish target EBITs for the Company's
          various divisions and Subsidiaries (respectively, "Divisional EBIT").
          As soon as practicable after each Plan Year, the Committee shall
          determine the levels of Consolidated EBIT, the United States EBIT and
          the respective Divisional EBITs which were achieved during the Plan
          Year.

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

    (k)   "Participant" shall mean an officer or other employee of the Company
          or one of its Subsidiaries who is eligible to participate herein
          pursuant to Section 3 hereof and for whom a target Bonus is
          established with respect to the relevant Plan Year.

                                       12

<PAGE>

    (l)   "Performance Goal" shall have the meaning given such term in Section
          4(c) hereof.

    (m)   "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 date
          hereof 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 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.

    (n)   "Personal Performance Percentage" shall have the meaning given such
          term in Section 4(c)

                                       13

<PAGE>

hereof.

    (o)   "Plan" shall mean Mine Safety Appliances Company Annual Incentive
          Bonus Plan, as amended from time to time.

    (p)   "Plan Year" shall mean the Company's fiscal year.

    (q)   "Subsidiary" shall mean any subsidiary of the Company which is
          designated by the Board or the Committee to have any one or more of
          its employees participate in the Plan.

                                       14

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