MALLINCKRODT GROUP INC
SC 13G/A, 1997-02-10
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*


                             MALLINCKRODT GROUP INC.
                   ------------------------------------------
                                (Name of Issuer)

                                  COMMON STOCK
                   ------------------------------------------
                         (Title of Class of Securities)

                                    561232109
                         ------------------------------
                                 (CUSIP Number)



- ----------------
*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                        (Continued on following page(s))

                                Page 1 of 7 Pages
<PAGE>

CUSIP No. 561232109                    13G                     Page 2 of 7 Pages


1.   NAME OF REPORTING PERSONS
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

     College Retirement Equities Fund
     I.R.S. #13-6022-042


2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) ( )
                                                                         (b) (X)
     See Exhibit A Attached

3.   SEC USE ONLY


4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     New York


NUMBER OF SHARES BENEFICIALLY OWNED
BY EACH REPORTING PERSON WITH:

     5.  SOLE VOTING POWER                   4,199,750

     6.  SHARED VOTING POWER                 None

     7.  SOLE DISPOSITIVE POWER              4,199,750

     8.  SHARED DISPOSITIVE POWER            None


9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                4,199,750

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
     SHARES*                                            (  )


11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                                5.68%

12.  TYPE OF REPORTING PERSON*

                                IV



                      * SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>




CUSIP No. 561232109                    13G                     Page 3 of 7 Pages


1.   NAME OF REPORTING PERSONS
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

     TIAA Separate Account VA-1
     I.R.S. #13-1624203


2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) ( )
                                                                         (b) (X)
     See Exhibit A Attached

3.   SEC USE ONLY


4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     New York


NUMBER OF SHARES BENEFICIALLY OWNED
BY EACH REPORTING PERSON WITH:

     5. SOLE VOTING POWER                     3,200

     6. SHARED VOTING POWER                   None

     7. SOLE DISPOSITIVE POWER                3,200

     8. SHARED DISPOSITIVE POWER              None


9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                3,200

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
     SHARES*                                            (  )


11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                                0.00%

12.  TYPE OF REPORTING PERSON*

                                IV



                      * SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>

                                                               Page 4 of 7 Pages


Item 1(a).      NAME OF ISSUER:

                Mallinckrodt Group Inc.

Item 1(b).      ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                7733 Forsyth Boulevard
                St. Louis, MO  63105-1820

Item 2(a).      NAME OF PERSON FILING:

                (1)  College Retirement Equities Fund ("CREF")
                (2)  TIAA Separate Account VA-1 ("VA-1")

Item 2(b).      ADDRESS OF PRINCIPAL BUSINESS OFFICE:

                (1) CREF -     730 Third Avenue
                               New York, N.Y.  10017

                (2) VA-1 -     730 Third Avenue
                               New York, N.Y.  10017

Item 2(c).      CITIZENSHIP:

                (1) CREF - Incorporated in the State of New York

                (2) VA-1 - Established in the State of New York

Item 2(d).      TITLE OF CLASS OF SECURITIES:

                Common Stock

Item 2(e).      CUSIP NUMBER:  561232109

Item 3.    IF THIS STATEMENT IS FILED PURSUANT TO RULES  13d-1(b),  OR 13d-2(b),
           CHECK WHETHER THE PERSON FILING IS:

(a)  ( )   Broker or dealer registered under Section 15 of the Act,
(b)  ( )   Bank as defined in Section 3(a)(6) of the Act,
(c)  ( )   Insurance Company as defined in Section 3(a)(19) of the Act,
(d)  (x)   Investment  Company  registered  under  Section  8 of the  Investment
           Company Act,
(e)  ( )   Investment  Adviser  registered  under Section 203 of the  Investment
           Advisers Act of 1940,
(f)  ( )   Employee  Benefit  Plan,   Pension  Fund  which  is  subject  to  the
           provisions of the Employee  Retirement Income Security Act of 1974 or
           Endowment Fund; see 13d-1(b)(1)(ii)(F),
(g)  ( )   Parent Holding Company, in accordance with Rule 13d- 1(b)(ii)(G); see
           Item 7,
(h)  (x)   Group, in accordance with Rule 13d-1(b)(1)(ii)(H).
<PAGE>

                                                               Page 5 of 7 Pages

Item 4.    OWNERSHIP.

(1)  COLLEGE RETIREMENT EQUITIES FUND

     (a)       Amount Beneficially Owned:  4,199,750

     (b)       Percent of Class:  5.68%

     (c)       Number of shares as to which such person has

     (i)       sole power to vote or direct the vote:  4,199,750

     (ii)      shared power to vote or to direct the vote:  None

     (iii)     sole power to dispose or to direct the disposition
               of:  4,199,750

     (iv)      shared power to dispose or to direct the disposition:
               None

(2)  TIAA SEPARATE ACCOUNT VA-1

     (a)       Amount Beneficially Owned:  3,200

     (b)       Percent of Class:  0.00%

     (c)       Number of shares as to which such person has

     (i)       sole power to vote or direct the vote:  3,200

     (ii)      shared power to vote or to direct the vote:  None

     (iii)     sole power to dispose or to direct the disposition
               of:  3,200

     (iv)      shared power to dispose or to direct the disposition:
               None

Item 5.    OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

If this  statement  is being filed to report the fact that as of the date hereof
the  reporting  person has ceased to be the  beneficial  owner of more than five
percent of the class of securities, check the following ( ).

Item 6.    OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.


                                 Not Applicable
<PAGE>

                                                               Page 6 of 7 Pages


Item 7.    IDENTIFICATION  AND  CLASSIFICATION  OF THE SUBSIDIARY WHICH ACQUIRED
           THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.


           Not Applicable


Item 8.    IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

           See attached Exhibit A.

Item 9.    NOTICE OF DISSOLUTION OF GROUP: Not Applicable


Item 10.   CERTIFICATION.

           By signing  below I certify  that,  to the best of my  knowledge  and
           belief,  the  securities  referred  to  above  were  acquired  in the
           ordinary  course of business and were not acquired for the purpose of
           and do not have the effect of changing or influencing  the control of
           the issuer of such  securities  and were not  acquired in  connection
           with or as a participant in any  transaction  having such purposes or
           effect.


                                    SIGNATURE


         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:  January 1, 1997
                                             COLLEGE RETIREMENT EQUITIES FUND


                                             By: /s/ Diane Axelrod
                                                 -------------------------------
                                                 Diane Axelrod,
                                                 Vice President

                                             TIAA SEPARATE ACCOUNT VA-1

                                             By: /s/ Diane Axelrod
                                                 -------------------------------
                                                 Diane Axelrod,
                                                 Vice President
<PAGE>

                                                               Page 7 of 7 Pages



                                    EXHIBIT A

            IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
            ---------------------------------------------------------


College Retirement Equities Fund - IV
TIAA Separate Account VA-1 - IV


The  College  Retirement  Equities  Fund and TIAA  Separate  Account  VA-1  (the
"Reporting  Persons") are filing as a group because  their  investment  advisers
(TIAA-CREF   Investment   Management,   Inc.   and  Teachers   Advisors,   Inc.,
respectively),  while distinct  entities,  are affiliated and employ some of the
same investment  personnel.  However,  because separate investment decisions are
made with respect to the respective  portfolio holdings of each of the Reporting
Persons  and there is no oral or  written  agreement  or  arrangement  among the
Reporting Persons with respect to acquisition,  voting, disposition or otherwise
of their securities, each Reporting Person disclaims beneficial ownership of the
others'  securities  holdings and disclaims  its  membership in a group with the
other Reporting Person.




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