THERMO ELECTRON CORP
SC 13D/A, 1999-01-22
MEASURING & CONTROLLING DEVICES, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 1)

                            Trex Medical Corporation

                                (Name of Issuer)

                     Common Stock, par value $.01 per share
 ------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    89531R101
                                 (CUSIP Number)

                             Seth H. Hoogasian, Esq.
                                 General Counsel
                                  (781)622-1000

                           Thermo Electron Corporation
                                 81 Wyman Street
                             Waltham, MA 02454-9046

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

 (Name, Address and Telephone Number of Person Authorized to Receive Notices
                             and Communications)


                              November 10, 1998
- ------------------------------------------------------------------------------
           (Date of Event which Requires Filing of this Statement)

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

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this  schedule  because  of Rule  13d-1(e),  13d-1(f)  or  13d-1(g),  check  the
following box [ ].
- ------------------------------------------------------------------------------




<PAGE>


- -------------------------------------------------------------------------------
            1              NAME OF REPORTING PERSON
                           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                           Thermo Electron Corporation
                           IRS No. 04-2209186
- ---------------------------
- -------------------------------------------------------------------------------
            2              CHECK THE APPROPRIATE BOX IF A MEMBER OF A
                           GROUP*

- ---------------------------
- ---------------------------
                                                                       (a) [   ]
                                                                       (b) [ x ]
- -------------------------------------------------------------------------------
- ---------------------------
            3              SEC USE ONLY
- -------------------------------------------------------------------------------
            4              SOURCE OF FUNDS*


                           WC
- ---------------------------
- -------------------------------------------------------------------------------
            5              CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS
                           IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                           [   ]
- -------------------------------------------------------------------------------
- ---------------------------
            6              CITIZENSHIP OR PLACE OF ORGANIZATION


                           State of Delaware
- -------------------------------------------------------------------------------
 NUMBER OF SHARES     7    SOLE VOTING POWER
   BENEFICIALLY
  OWNED BY EACH
 REPORTING PERSON          26,046,509
       WITH
- -------------------------------------------------------------------------------
                      8    SHARED VOTING POWER


                           0
- -------------------------------------------------------------------------------
                      9    SOLE DISPOSITIVE POWER


                           26,046,509
- -------------------------------------------------------------------------------
                     10    SHARED DISPOSITIVE POWER


                           0
- ------------------------------------------------------------------------------- 


<PAGE>


- -------------------------------------------------------------------------------
            11             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 
                           REPORTING PERSON

                           26,046,509

- -------------------------------------------------------------------------------
            12             CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
                           EXCLUDES CERTAIN SHARES*                        [   ]
- -------------------------------------------------------------------------------

            13             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11


                           77.7%
- -------------------------------------------------------------------------------
            14             TYPE OF REPORTING PERSON *

                           CO
- -------------------------------------------------------------------------------


<PAGE>


      Thermo  Electron  Corporation  hereby amends its statement on Schedule 13D
relating to the shares (the "Shares") of common stock, par value $.01 per share,
of Trex Medical Corporation (the "Issuer"), as set forth below.

Item 2.     Identity and Background

      Item 2 is hereby amended and restated in its entirety as follows:

      This  Amendment  is  being  filed  by  Thermo  Electron  Corporation  (the
"Reporting  Person"),  pursuant  to Rule  13d-2,  to reflect an  increase in the
Reporting  Person's holdings of the Issuer's Shares since the Reporting Person's
last  filing on Schedule  13D,  in July,  1996,  of more than one  percent.  The
Reporting  Person  holds the Shares of the Issuer  that are the  subject of this
Amendment  through one or more controlled  subsidiaries.  As of the date of this
Amendment, 23,801,909 Shares were held by ThermoTrex Corporation ("ThermoTrex"),
a majority-owned subsidiary of the Reporting Person.

      The Reporting  Person develops,  manufactures  and markets  analytical and
monitoring  instruments;  biomedical  products including  heart-assist  devices,
respiratory-care  equipment,  and mammography  systems;  and paper-recycling and
papermaking  equipment.  The Reporting  Person also develops  alternative-energy
systems  and clean  fuels,  provides a range of  services  including  industrial
outsourcing and  environmental-liability  management,  and conducts research and
development  in  advanced   imaging,   laser   communications,   and  electronic
information-management technologies.

      The  principal  business  address  and  principal  office  address  of the
Reporting  Person,  a  Delaware  corporation,   is  81  Wyman  Street,  Waltham,
Massachusetts 02454-9046.

      Appendix  A attached  to this  Amendment  sets forth with  respect to each
executive  officer and director of the Reporting Person his or her (a) name; (b)
residence or business address;  (c) present  principal  occupation or employment
and the  name,  principal  business  and  address  of any  corporation  or other
organization in which such employment is conducted; and (d) citizenship.  To the
knowledge of the Reporting Person,  there is no person who may be deemed to be a
controlling person of the Reporting Person.

      During  the last five  years,  neither  the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting Person has been convicted in a criminal proceeding  (excluding traffic
violations and similar misdemeanors).



<PAGE>


      During  the last five  years,  neither  the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting  Person  has  been a party  to a civil  proceeding  of a  judicial  or
administrative  body of competent  jurisdiction  which  resulted in a judgement,
decree or final order (i) enjoining  future  violations  of, or  prohibiting  or
mandating  activities  subject  to,  federal  or state  securities  laws or (ii)
finding a violation with respect to such laws.

Item 3.     Source and Amount of Funds or Other Consideration.

      Item 3 is hereby amended and restated in its entirety as follows:

      The Reporting Person has expended approximately  $17,525,750 in purchasing
Shares of the Issuer  since the date of its last filing on Schedule  13D.  These
funds were paid out of the Reporting Person's working capital.

Item 4.     Purpose of Transaction

      Item 4 is hereby amended and restated in its entirety as follows:

      The Reporting  Person may make purchases of Shares or other  securities of
the  Issuer  in  such  manner  and  in  such  amounts  as  it  determines  to be
appropriate. In determining whether to do so, the Reporting Person will consider
various  relevant  factors,  including its evaluation of the Issuer's  business,
prospects and financial condition, amounts and prices of available securities of
the  Issuer,  the  market  for  the  Issuer's  securities,  other  opportunities
available to the Reporting  Person and general  market and economic  conditions.
Purchases may be made either on the open market or directly from the Issuer.

      Except  as set  forth in this  Item 4 and Item 6,  neither  the  Reporting
Person nor, to the Reporting Person's  knowledge,  any of the executive officers
or directors of the Reporting  Person has any current  plans or proposals  which
relate to or would result in any of the actions specified in clauses (a) through
(j) of Item 4 of Schedule  13D,  although  the  Reporting  Person and such other
persons do not rule out the  possibility  of  effecting or seeking to effect any
such actions in the future.

Item 5.     Interest in Securities of the Issuer.

      Items 5 (a) - (c) are hereby  amended and  restated  in their  entirety as
follows:
<PAGE>

      (a)  The  Shares  beneficially  owned  by  the  Reporting  Person  include
2,244,600  Shares,  or  approximately  6.8%  of the  outstanding  Shares,  owned
directly by the Reporting Person, and 23,801,909 Shares, or approximately  71.0%
of the outstanding Shares,  owned by ThermoTrex.  Of the 23,801,909 Shares owned
by ThermoTrex, 678,541 Shares are issuable to ThermoTrex if it elects to convert
in full the remaining principal amount of the 4.2% Convertible Subordinated Note
(the  "Note")  issued by the Issuer to  ThermoTrex  on  October 2, 1996.  To the
knowledge of the Reporting Person,  the executive  officers and directors of the
Reporting   Person   beneficially   own  an  aggregate  of  319,475   Shares  or
approximately 1.0% of the outstanding  Shares. To the knowledge of the Reporting
Person, the Shares beneficially owned by all executive officers and directors of
the Reporting  Person include 288,500 Shares that such persons have the right to
acquire  within  60 days  through  the  exercise  of  stock  options.  Ownership
information for each executive  officer and director of the Reporting  Person is
set forth below.

Name                                            Number of Shares(1)
- ----                                            -------------------
John M. Albertine                                         1,000
Peter O. Crisp                                            4,500
Elias P. Gyftopoulos                                     41,000
George N. Hatsopoulos                                    41,188
John N. Hatsopoulos                                      32,263
Brian D. Holt                                             4,000
Frank Jungers                                             3,850
Paul F. Kelleher                                          9,000
John T. Keiser                                           20,000
Earl R. Lewis                                            38,851
Robert A. McCabe                                          7,050
Theo Melas-Kyriazi                                        4,000
Donald E. Noble                                           1,000
Robert W. O'Leary                                             0
Hutham S. Olayan                                         46,173
Peter G. Pantazelos                                       4,600
William A. Rainville                                     20,000
Arvin H. Smith                                           20,000
Richard F. Syron                                              0
Roger D. Wellington                                       1,000
John W. Wood Jr.                                         20,000
All directors and current executive                     319,475
officers as a group (21 persons)
<PAGE>

     (1) Shares reported as beneficially owned by Dr. Albertine,  Mr. Crisp, Dr.
Gyftopoulos,  Dr. G. Hatsopoulos, Mr. J. Hatsopoulos, Mr. Holt, Mr. Jungers, Mr.
Kelleher,  Mr. Keiser, Mr. Lewis, Mr. McCabe, Mr. Melas-Kyriazi,  Mr. Noble, Ms.
Olayan, Mr. Pantazelos,  Mr. Rainville, Mr. Smith, Mr. Wellington,  Mr. Wood and
all directors and executive  officers as a group include 1,000,  1,500,  40,000,
40,000,  32,000,  4,000,  1,000,  6,000,  20,000,  32,000,  1,000, 4,000, 1,000,
40,000, 4,000, 20,000,  20,000, 1,000, 20,000 and 288,500 Shares,  respectively,
that such  person or members  of the group  have the right to acquire  within 60
days.

While certain directors and executive  officers of the Reporting Person are also
directors  and  officers of the Issuer,  all such  persons  disclaim  beneficial
ownership of the Shares owned by the Reporting Person.

(b) The  Reporting  Person  and the  executive  officers  and  directors  of the
Reporting Person have the sole power to vote and dispose of the Shares each such
person  owns,  except as  follows:  16 Shares  included  in Dr. G.  Hatsopoulos'
ownership are owned by his spouse,  and Shares  beneficially owned by Ms. Olayan
include  1,173  Shares  allocated  to her  account  maintained  pursuant  to the
Issuer's deferred compensation plan for directors.

(c) The Reporting Person has effected the following transactions with respect to
the Shares during the past 60 days:
<PAGE>

     Date          Amount         Price Per Share            Transfer Type
- -------------------------------------------------------------------------------
11/10/98        318,000       $11.52                   Open Market Purchase
11/11/98         10,000       $11.25                   Open Market Purchase
11/11/98         13,000       $11.4375                 Open Market Purchase
11/11/98         59,500       $11.3125                 Open Market Purchase
11/11/98         58,700       $11.375                  Open Market Purchase
11/11/98        109,700       $11.25                   Open Market Purchase
12/01/98         22,000       $9.75                    Open Market Purchase
12/11/98            500       $8.1875                  Open Market Purchase
12/11/98            700       $8.25                    Open Market Purchase
12/11/98          6,600       $8.625                   Open Market Purchase
12/11/98        750,600       $8.269                   Open Market Purchase
12/11/98         13,200       $8.75                    Open Market Purchase
12/14/98        154,500       $7.25                    Open Market Purchase
12/14/98         65,100       $7.3125                  Open Market Purchase
12/14/98         15,700       $6.75                    Open Market Purchase
12/14/98          8,700       $6.50                    Open Market Purchase
12/14/98          2,600       $6.875                   Open Market Purchase
12/14/98          2,000       $7.00                    Open Market Purchase
12/14/98            700       $6.625                   Open Market Purchase
12/14/98          3,000       $7.125                   Open Market Purchase
12/15/98          1,000       $7.0625                  Open Market Purchase
12/15/98          1,100       $7.25                    Open Market Purchase
12/15/98         47,000       $7.125                   Open Market Purchase
12/15/98          3,000       $7.1875                  Open Market Purchase
12/15/98        165,200       $7.00                    Open Market Purchase
12/16/98         34,900       $7.50                    Open Market Purchase
12/16/98            500       $7.25                    Open Market Purchase
12/17/98          3,200       $7.50                    Open Market Purchase
12/21/98          1,100       $7.6875                  Open Market Purchase
12/21/98         60,600       $8.00                    Open Market Purchase
12/21/98         18,100       $7.6875                  Open Market Purchase
12/21/98          5,800       $7.5625                  Open Market Purchase


To the knowledge of the Reporting Person,  the executive  officers and directors
of the Reporting  Person have effected no transactions in the Shares in the past
60 days.

     Item 6.  Contracts,  Arrangements,  Understandings  or  Relationships  with
respect to Securities of the Issuer.
<PAGE>

      Item 6 is hereby amended and restated in its entirety as follows:

      Of the 26,046,509 Shares  beneficially  owned by the Reporting Person, (a)
302,900  Shares are  subject to options to acquire  such  Shares  granted by the
Reporting  Person  pursuant to its director and employee  stock option plans and
(b) 678,541  Shares are issuable to  ThermoTrex  if it elects to convert in full
the remaining principal amount of the Note. The executive officers and directors
of the Reporting  Person have the right,  pursuant to such  options,  to acquire
97,000 Shares. In addition,  the following  executive  officers and directors of
the Reporting  Person have the right to acquire shares from the Issuer  pursuant
to the Issuer's  director and employee stock option plans: Dr. Elias Gyftopoulos
has the right to acquire  40,000 Shares within 60 days;  Dr. George  Hatsopoulos
has the right to acquire 40,000 Shares within 60 days; Mr. John  Hatsopoulos has
the right to acquire  32,000  Shares  within 60 days;  Mr. Paul Kelleher has the
right to acquire  6,000 Shares  within 60 days;  Mr. Earl Lewis has the right to
acquire  32,000  Shares  within 60 days;  and Ms. Hutham Olayan has the right to
acquire 40,000 Shares within 60 days.

      During  fiscal  1996,  the  Human  Resources  Committee  of the  Board  of
Directors of the Issuer (the "Committee") established a stock holding policy for
executive  officers  of the  Issuer.  The  stock  holding  policy  specifies  an
appropriate  level of  ownership  of the  Issuer's  Shares as a multiple  of the
officer's  compensation.  For the chief executive  officer,  the multiple is one
times his base salary and reference  bonus for the calendar  year. For all other
officers, the multiple is one times the officer's base salary.

      In order to assist  officers in complying  with the policy,  the Committee
also  adopted  a stock  holding  assistance  plan  under  which  the  Issuer  is
authorized  to make  interest-free  loans to officers to enable them to purchase
Shares in the open market.  The loans are required to be repaid upon the earlier
of demand or the fifth  anniversary  of the date of the loan,  unless  otherwise
authorized by the Committee.

      The Committee  also adopted a policy  requiring its executive  officers to
hold Shares  acquired upon the exercise of stock options  granted by the Issuer.
Under this policy, executive officers are required to hold one-half of their net
option  exercises  over a period  of five  years.  The net  option  exercise  is
determined by calculating the number of shares acquired upon exercise of a stock
option,  after  deducting  the number of shares  that could have been  traded to
exercise the option and the number of shares that could have been surrendered to
satisfy tax withholding obligations attributable to the exercise of the option.

     During fiscal 1996, the Committee  also  established a stock holding policy
for directors, including persons who are also directors or executive officers of
the Reporting Person (Gary S. Weinstein,  Elias P.  Gyftopoulos,  John T. Keiser
and Hutham  Olayan).  The stock holding policy  requires each director to hold a
minimum of 1,000 Shares.
<PAGE>

      In addition,  the Committee  adopted a policy requiring  directors to hold
Shares  equal to  one-half of their net option  exercises  over a period of five
years. The net option exercise is determined by calculating the number of shares
acquired upon exercise of a stock option,  after  deducting the number of shares
that could have been traded to exercise the option and the number of shares that
could have been surrendered to satisfy tax withholding obligations  attributable
to the exercise of the option.

      Item 7.   Material to Be Filed as Exhibits

      The  following  documents  relating  to the  securities  of the Issuer are
incorporated herein by reference.

      (i)  $42,000,000  Subordinated  Convertible  Note due  2000 of the  Issuer
issued  to  ThermoTrex  (filed  as  Exhibit  4.2  to the  Issuer's  Registration
Statement on Form S-1 [Reg. No. 333-2926] and incorporated herein by reference).

     (ii) Equity  Incentive  Plan of the Issuer  (filed as Exhibit  10.15 to the
Issuer's Registration Statement on Form S-1 [Reg. No. 333-2926] and incorporated
herein by reference).

     (iii)  Deferred  Compensation  Plan for  Directors of the Issuer  (filed as
Exhibit  10.16 to the  Issuer's  Registration  Statement  on Form S-1 [Reg.  No.
333-2926] and incorporated herein by reference).

     (iv)  Directors  Stock Option Plan of the Issuer (filed as Exhibit 10.17 to
the  Issuer's  Registration  Statement  on Form  S-1  [Reg.  No.  333-2926]  and
incorporated herein by reference).

      (v) Directors' Stock Option Plan of ThermoTrex  (filed as Exhibit 10.26 to
ThermoTrex's  Annual Report on Form 10-K for the fiscal year ended  December 31,
1994 [File No. 1-10791] and incorporated herein by reference).

      (vi) ThermoTrex  Corporation-Trex  Medical Corporation  Nonqualified Stock
Option Plan (filed as Exhibit 10.73 to Thermo Cardiosystems Inc.'s Annual Report
on Form 10-K for the fiscal year ended December 30, 1995 [File No.  1-10114] and
incorporated herein by reference).

      (vii) Amended and Restated  Directors'  Stock Option Plan of the Reporting
Person (filed as Exhibit 10.25 to the Reporting  Person's  Annual Report on Form
10-K for the  fiscal  year  ended  December  31,  1994  [File  No.  1-8002]  and
incorporated herein by reference).

      (viii) Thermo Electron  Corporation-Trex  Medical Corporation Nonqualified
Stock Option Plan (filed as Exhibit 10.44 to Thermo  Cardiosystems Inc.'s Annual
Report on Form 10-K for the  fiscal  year  ended  September  30,  1995 [File No.
1-10114] and incorporated herein by reference).

      (ix)  Amended  and  Restated  Stock  Holding  Assistance  Plan and Form of
Promissory Note (filed as Exhibit 10.18 to the Annual Report on Form 10-K of the
Issuer for the fiscal  year ended  September  27,  1997 [File No.  1-11827]  and
incorporated herein by reference).



<PAGE>


Signature

      After reasonable  inquiry and to the best of its knowledge and belief, the
Reporting  Person  certifies that the information set forth in this statement is
true, complete and correct.


Date: January 22, 1999                       THERMO ELECTRON CORPORATION

                                             By:  /s/   Theo Melas-Kyriazi
                                                  Theo Melas-Kyriazi
                                                  Vice President and 
                                                  Chief Financial Officer


<PAGE>


      Appendix A is hereby amended and restated in its entirety as follows:

                                   APPENDIX A

      The following  individuals  are executive  officers or directors of Thermo
Electron  Corporation  ("Thermo  Electron").  Unless  otherwise  noted, all such
individuals  are citizens of the United  States.  Unless  otherwise  noted,  the
business address of each executive officer and director of Thermo Electron is 81
Wyman Street, Waltham, Massachusetts 02454-9046.

John M. Albertine:                           Director, Thermo Electron

      Dr.  Albertine  is  Chairman of the Board and Chief  Executive  Officer of
Albertine Enterprises,  Inc., an economic and public policy consulting firm. His
business  address is Albertine  Enterprises,  Inc., 1156 15th Street N.W., Suite
505, Washington, DC 20005.

Peter O. Crisp:                              Director, Thermo Electron

     Mr. Crisp was, until August 1997, a General Partner of Venrock  Associates,
a venture capital investment firm.

Elias P. Gyftopoulos:                        Director, Thermo Electron

     Dr.  Gyftopoulos is Professor  Emeritus of the  Massachusetts  Institute of
Technology. His business address is Massachusetts Institute of Technology,  Room
24-109, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139.

Frank Jungers:                               Director, Thermo Electron

     Mr.  Jungers is a consultant on business and energy  matters.  His business
address is 822 NW Murray, Suite 242, Portland, Oregon 97229.

Robert A. McCabe:                            Director, Thermo Electron

     Mr. McCabe is President of Pilot Capital  Corporation,  a firm specializing
in private  investment and acquisition  services.  His business address is Pilot
Capital Corporation, 444 Madison Avenue, Suite 2103, New York, New York 10022.

<PAGE>

Donald E. Noble:                             Director, Thermo Electron

     For more than 20 years,  from 1959 to 1980,  Mr.  Noble served as the Chief
Executive Officer of Rubbermaid, Incorporated, first with the title of President
and  then  as  Chairman  of  the  Board.  His  business  address  is  Rubbermaid
Incorporated, 1147 Akron Road, Wooster, Ohio 44691.

Robert W. O'Leary:                           Director, Thermo Electron

     Mr. O'Leary is the Chairman and Chief Executive Officer of Premier, Inc., a
strategic healthcare alliance.  His business address is Premier,  Inc., 12225 El
Camino Real, San Diego, California 92130.

Hutham S. Olayan:                            Director, Thermo Electron

     Ms. Olayan is the President  and a director of Olayan  America  Corporation
and  President  of  Competrol  Real Estate  Limited,  firms  engaged in advisory
services and private  real estate  investments.  Her  business  address is Suite
1100,  505 Park Avenue,  New York,  New York 10022.  Ms.  Olayan is a citizen of
Saudi Arabia.

Richard F. Syron:                            Director, Thermo Electron

     Mr.  Syron has served as the Chairman  and Chief  Executive  Officer of the
American Stock Exchange since 1994. Mr. Syron was President and Chief  Executive
Officer of the Federal  Reserve  Bank of Boston from 1989 to 1994.  His business
address is 86 Trinity Place, New York, New York 10006.

Roger D. Wellington:                         Director, Thermo Electron

     Mr.  Wellington is the President and Chief Executive  Officer of Wellington
Consultants,  Inc. and of Wellington  Associates,  Inc.,  international business
consulting firms.
<PAGE>

George N. Hatsopoulos:                       Director, Chairman of the Board and
                                             Chief Executive Officer, Thermo
                                             Electron
John N. Hatsopoulos:                         Director and Vice Chairman of the
                                             Board, Thermo Electron
Peter G. Pantazelos:                         Executive Vice President, Corporate
                                             Development, Thermo Electron
Arvin H. Smith:                              President, Thermo Electron
Earl R. Lewis:                               Chief Operating Officer,
                                             Instrumentation, Thermo Electron
William A. Rainville:                        Chief Operating Officer, Recycling
                                             and Recovery Systems, Thermo
                                             Electron
John W. Wood Jr.:                            Senior Vice President, Thermo
                                             Electron
Paul F. Kelleher:                            Senior Vice President, Finance &
                                             Administration and Chief Accounting
                                             Officer, Thermo Electron
Brian D. Holt:                               Chief Operating Officer,
                                             Environmental and Energy, Thermo
                                             Electron
John T. Keiser:                              Chief Operating Officer, Biomedical
                                             and New Technologies, Thermo
                                             Electron
Theo Melas-Kyriazi:                          Vice President and Chief Financial
                                             Officer, Thermo Electron


Mr. Melas-Kyriazi is a citizen of Greece.





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