Document:

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                                                                Exhibit 10.4 (d)

                            AMENDMENT NUMBER THREE
                                    to the
                    SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN
                                      for
                            MALLINCKRODT GROUP INC.

     The Supplemental Executive Retirement Plan for Mallinckrodt Group Inc. (the
"Plan"), is hereby amended, effective as of June 15, 2000, as set forth below.

     Capitalized terms used herein without definition shall have the respective
meanings set forth in the Plan.

     1.   Section 6.11.
          ------------

     (a)  The definition of "Good Reason" set forth in Section 6.11(a)(ii) of
the Plan is amended by deleting the last sentence thereof which currently reads
"The Participant must notify the Company of an event constituting Good Reason
within ninety (90) days following his knowledge of its existence or such event
shall not constitute Good Reason under the Plan."

     (b)  The definition of "Cause" set forth in Section 6.11(a)(iii) of the
Plan is amended to include the phrase "which remains uncured for a period of ten
(10) days" immediately following the parenthetical "(other than any failure due
to physical or mental incapacity)".

     2.   The validity, interpretation, and enforcement of this amendment shall
be governed by the law of the State of New York.  The invalidity or
unenforceabililty of any provision of this amendment shall not affect the
validity or enforceabililty of any other provision of this amendment or of the
Plan, as amended hereby, which other provisions shall remain in full force and
effect.<PAGE>

                                                                Exhibit 10.6 (c)

                               AMENDMENT to the
                    MANAGEMENT INCENTIVE COMPENSATION PLAN
                             for IMCERA GROUP INC.
                                      and
              FISCAL 2000 MANAGEMENT INCENTIVE COMPENSATION PLAN
                                      of
                               MALLINCKRODT INC.

          The Management Incentive Compensation Plan for IMCERA Group, Inc.,
previously amended as of April 19, 1996 (the "IMCERA Group Plan") and the
Mallinckrodt Inc. FISCAL 2000 Management Incentive Compensation Plan (the
"Fiscal 2000 Plan"), is hereby amended, effective as of June 15, 2000, as set
forth below.

          Capitalized terms used herein without definition shall have the
respective meanings set forth in the IMCERA Group Plan.

          1.   Section 4 of IMCERA Group Plan.  Target Incentive Awards.
               --------------------------------------------------------

          Section 4 of the IMCERA Group Plan shall be amended by adding the
following at the end of the Section:

               "Notwithstanding the foregoing or any other provision hereof, all
     Target Awards for the fiscal year beginning July 1, 1999 ("Fiscal 2000")
     shall be indexed against changes in the Company's common stock price from
     the beginning to the end of Fiscal 2000 as determined in the following
     manner: the amount of any Target Award to be used in determining the amount
     payable to a participant hereunder shall be increased or reduced, as
     appropriate, by the percentage change in the Company's common stock price
     calculated by comparing $27.50 (representing the closing price of the
     Company's common stock, as reflected on the New York Stock Exchange
     Composite transactions tape ("NYSE Tape") on June 15, 2000) (the "Fiscal
     2000 Price") against the average of the high and low price of the Company's
     common stock, as reflected on the NYSE Tape, during the last fifteen (15)
     New York Stock Exchange trading days of the fiscal year beginning July 1,
     1998." Notwithstanding the foregoing, in the event a Change in Control
     occurs during the Company's Fiscal 2000 or during the Company's fiscal year
     beginning July 1, 2000 as a result of negotiations which commenced during
     Fiscal 2000 (a "Qualifying Change of Control") then the Fiscal 2000 Price
     shall be deemed to be the greater of (x) $27.50 and (y) the Change of
     Control Price (as defined below).

               "Change of Control Price" shall mean the amount of consideration
     per share paid to the Company's shareholders in connection with the Change
     in Control. If the consideration paid to the Company's shareholders in
     connection with the Change of Control consists in whole or in part of other
     securities or other property or assets then the value of such securities or
     other property or assets shall be the fair market value of such securities
     or other property or assets as determined on the day prior to the
     consummation of the Change in Control. If such securities are publicly
     traded securities of another corporation ("Acquiror Stock") the fair market
     value of such securities shall be the volume-weighted average of the per
     share selling price of Acquiror Stock for the five consecutive trading days
     ending on the second trading day prior to the consummation of the Change of
     Control (the "Trading Period") on the Composite Tape of the principal
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     national securities exchange on which such shares of Acquiror Stock are
     listed or, if no Composite Tape exists for such national securities
     exchange on such date, then on the principal national securities exchange
     on which such shares are listed or admitted to trading, or if such shares
     are not listed or admitted on a national securities exchange, then by the
     average arithmetic means of the per share closing bid price and per share
     closing asked price of such share of Acquiror Stock during the Trading
     Period as quoted on the National Associate of Securities Dealers Automated
     Quotation system (or such market in which such prices are regularly
     quoted). If such securities are not publicly traded securities or if the
     consideration paid is other property or assets, then the fair market value
     of such securities, other property or assets shall be as determined by the
     Board of Directors in good faith in consideration of all relevant factors,
     including any recent trading price of the Company's common stock, and based
     upon the advice of the investment bank or other third party financial
     expert assisting the Company for purposes of evaluating the Change of
     Control transaction.

          In the event an incentive award is paid to a participant hereunder
     prior to the consummation of a Qualifying Change of Control and a
     Qualifying Change of Control subsequently occurs, then the amount of the
     participant's Target Award shall be recalculated based upon the Change of
     Control Price and if the amount of the Target Award, as recalculated, is
     greater, the participant shall be entitled to a supplemental payment
     hereunder based upon such recalculated Target Award. Any such supplemental
     payment shall be paid to the participant in cash within 30 days following
     the consummation of a Qualifying Change of Control."

          2.   Section 11 of IMCERA Group Plan.  Change in Control.
               ---------------------------------------------------

          (a)  The definition of "Good Reason" set forth in Section 11(b) of the
IMCERA Group Plan is amended by deleting the last sentence thereof which
currently reads "The participant must notify the Company of an event
constituting Good Reason within ninety days following his knowledge of its
existence or such event shall not constitute Good Reason under the Plan."

          (b)  The definition of "Cause" set forth in Section 11(c) of the
IMCERA Group Plan is amended to include the phrase "which remains uncured for a
period of ten (10) days" immediately following the parenthetical "(other than
any failure due to physical or mental incapacity)".

          3.   Fiscal 2000 Plan
               ----------------

          (a)  Recognizing that Mallinckrodt Inc. intended to operate, and has
been operating, the Fiscal 2000 Plan as part of the IMCERA Group Plan, for the
avoidance of doubt, (i) the provisions of Section 11 of the IMCERA Group Plan
relating to "Change in Control", as amended hereby and (ii) the provisions of
Section 4 of the IMCERA Group Plan, as amended hereby, are in each case hereby
incorporated by reference into the Fiscal 2000 Plan. In the event of any
inconsistency between the provisions of the Fiscal 2000 Plan and the provisions
hereby incorporated therein by reference, the provisions incorporated therein by
reference shall apply.

          4.   The validity, interpretation, and enforcement of this amendment
shall be governed by the law of the State of New York. The invalidity or
unenforceabililty of any provision of this amendment shall not affect the
validity or enforceabililty of any other provision of this amendment or of the
Plan, as amended hereby, which other provisions shall remain in full force and
effect.<PAGE>

                                                           Exhibit 10.10(b)

                           AMENDMENT TO RABBI TRUST

          The Trust Agreement dated as of a August 16, 1996 by and between
Mallinckrodt Group Inc., a New York Corporation and Wachovia Bank of North
Carolina (the "Trust Agreement") is hereby amended, effective as of June 20,
2000, as set forth below.

          Capitalized terms used herein without definition shall have the
respective meanings set forth in the Trust Agreement.

          1.   Preamble.
               --------

          The first WHEREAS clause of the Trust Agreement is restated in its
entirety to read as follows:

               "WHEREAS, the Company has adopted the employee benefit plans and
     arrangements listed on Schedule I hereto (collectively, the "Plans"),
     copies of which are attached hereto as Appendix A, including, without
     limitation, the severance agreements between the Company and the employees
     of the Company listed on Schedule I (the "Severance Agreements" and
     together with the Corporate Staff Change in Control Severance Plan
     identified on Schedule I, the "Severance Programs")"

          2.   Section 1.  Establishment of Trust.
               ----------------------------------

          Section 1(f) is restated in its entirety to read as follows:

               "(f)  Immediately prior to or upon a Change in Control, the
     Company shall make an irrevocable contribution to the Trust in an amount in
     cash or other property (of the type specified in Section 5(a)) that is
     sufficient to pay each Participant (determined by allocations to separate
     accounts for each Participant) the accrued benefits (the "BENEFITS') to
     which such Participant and such Participant's spouse would be entitled
     under the Plans as of such date (which shall be deemed to include an amount
     necessary to fund the aggregate cash severance obligation for all employees
     covered by Severance Agreements and all Participants under the Corporate
     Staff Change in Control Severance Plan if such employees' and Participants'
     employment were terminated immediately following the Change in Control,
     other than as a result of a Nonqualifying Termination (as defined in the
     Severance Programs) (the "REQUIRED FUNDING AMOUNT"). Concurrently with the
     contribution of the Required Funding Amount, the Company shall also deposit
     $250,000 in cash to a separate account of the Trust (the "TRUSTEE EXPENSE
     ACCOUNT"), which account shall be used to reimburse the Trustee for its
     fees and reasonable expenses hereunder as provided in Section 9."

          3.   The validity, interpretation, and enforcement of this amendment
shall be governed by the law of the State of New York. The invalidity or
unenforceabililty of any provision of this amendment shall not affect the
validity or enforceabililty of any other provision of this amendment or of the
Trust Agreement, as amended hereby, which other provisions shall remain in full
force and effect. This amendment may be executed in two or more counterparts,
each of which shall be deemed to be an original and all of which together shall
constitute one and the same instrument.
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          IN WITNESS WHEREOF, the parties hereto have executed this amendment as
of the date first above written.

                                     MALLINCKRODT INC.

Date:      June 20, 2000             By: /s/ Bruce K. Crockett
     ---------------------               --------------------------------
                                         Name: Bruce K. Crockett
                                         Title: Vice President Human Resources

                                     WACHOVIA BANK OF NORTH CAROLINA,
                                     N.A.

Date:      June 20, 2000             By: /s/ Joe O. Long
     ---------------------               --------------------------------
                                         Name: Joe O. Long
                                         Title: Sr. Vice President/GE
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                                                                      Schedule I

                                                                   July 20, 2000

Severance Agreements (or any successor retention agreements) between the Company
and the following employees:

Abbett, Barbara
Baldessari, Keith
Chawla, Ashok
Collins, Michael
Crockett, Bruce
Fercho, Bradley
Given, Douglass
Greenspan, Ronald
Hesemann, John
Higgons, Richard
Holman, C. Ray
Keller, Roger
Kupferer, David
McKinney, Douglas
Milosovich, Michael
Mulholland, Daniel
Rocca, Michael
Shivley, R. Scott
Stone, William
Voltolina, Frank
Rizzi, Oscar
Olukotun, Oye
Forrest Whittaker

Puritan Bennett SERP and Makeup Plans

Mallinckrodt Supplemental Benefit Plans

Unfunded Deferred Payment Obligations for Harold Brinner

Unfunded Deferred Payment Obligations for Harold Thayer

Pilots Supplemental Pension Plan

Puritan Bennett Deferred Compensation Plan (including Burt Dole)

Puritan Bennett Directors Pension Plan

Premium payments under Mallinckrodt's executive life insurance program

Mallinckrodt Supplemental Retirement Plan (parts A and B)

Corporate staff Change-in-Control Plan
<PAGE>

Deferral election plan for non-employee directors

Mallinckrodt Director's Retirement Service Plan

Mallinckrodt Director Retirement Plan

All other unfunded nonqualified deferred compensation or deferred employee or
director severance or retirement payment obligations of Mallinckrodt Inc. or its
subsidiaries

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