THERMO ELECTRON CORP
SC 13D/A, 1997-06-16
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. 11)

                                Thermo Voltek Corp.
                          ----------------------------
                                (Name of Issuer)

                     Common Stock, par value $.05 per share
          ------------------------------------------------------------
                         (Title of Class of Securities)

                                   883602-10-4
                               ------------------
                                 (CUSIP Number)

               Seth H. Hoogasian, Esq.          Thermo Electron Corporation
               General Counsel                  81 Wyman Street
              (617) 622-1000                   Waltham, MA  02254-9046
            -----------------------------------------------------------

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

                                   June 17, 1996
           -----------------------------------------------------------
             (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(b)(3) or (4), check the
   following box [  ].

   * 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).
PAGE
<PAGE>





                NAME OF REPORTING PERSON
         1      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
                 7  SOLE VOTING POWER
    NUMBER OF 
                    228,200
      SHARES
                 8  SHARED VOTING POWER
   BENEFICIALLY
                    0
     OWNED BY    9  SOLE DISPOSITIVE POWER

        EACH        228,200
                 10 SHARED DISPOSITIVE POWER
     REPORTING
                    0
    PERSON WITH
PAGE
<PAGE>





        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                228,200
        12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                CERTAIN SHARES*

                                                                    [   ]

        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

                2.5%
        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>





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

                Thermedics Inc.
                IRS No. 04-2788806

         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

                Commonwealth of Massachusetts
                 7  SOLE VOTING POWER
    NUMBER OF       7,916,424

      SHARES
                 8  SHARED VOTING POWER
   BENEFICIALLY
                    0
     OWNED BY    9  SOLE DISPOSITIVE POWER
                    7,916,424
        EACH
                 10 SHARED DISPOSITIVE POWER
     REPORTING
                    0
    PERSON WITH
PAGE
<PAGE>





        11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                7,916,424

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

                                                                      [   ]

        13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                67.7%


        14      TYPE OF REPORTING PERSON *

                CO
PAGE
<PAGE>






        Pursuant to Rule 13d-2(c) under the Securities Exchange Act of 1934,
   this Amendment No. 11 to Schedule 13D amends and restates the entire text
   of the Schedule 13D, as previously amended, previously filed by Thermo
   Electron Corporation and its subsidiary Thermedics Inc. relating to shares
   of common stock, par value $.05 per share, of Thermo Voltek Corp.

   Item 1.  Security and Issuer.

        This Amendment relates to the shares (the "Shares") of common stock,
   par value $0.05 per share, of Thermo Voltek Corp. (the "Issuer").  The
   Issuer's principal executive offices are located at 470 Wildwood Street,
   Woburn, Massachusetts 01888.  

   Item 2.  Identity and Background.

        This Amendment is being filed by Thermo Electron Corporation ("Thermo
   Electron") and its subsidiary Thermedics Inc. ("Thermedics" and, together
   with Thermo Electron, the "Reporting Persons").  The Reporting Persons are
   filing this Amendment pursuant to Rule 13d-2 to reflect an increase in the
   Reporting Persons' holdings of the Issuer's Shares since the Reporting
   Persons' last filing on Schedule 13D, in February 1996, of more than one
   percent.  

        The principal business address and principal office address of Thermo
   Electron, a Delaware corporation, is 81 Wyman Street, Waltham,
   Massachusetts 02254-9046 and the principal business address and principal
   office address of Thermedics, a Massachusetts corporation, is 470 Wildwood
   Street, Woburn, Massachusetts 01888.

        Thermo Electron develops, manufactures and markets environmental,
   analytical and process control instruments, cogeneration and
   alternative-energy power plants, low-emission combustion systems, paper and
   waste-recycling equipment, and biomedical products.  Thermo Electron also
   provides a range of services including environmental remediation and
   consulting, laboratory analysis, and metals fabrication and processing, as
   well as research and product development in unconventional imaging,
   adaptive optics, and direct energy conversion.  

        Thermedics develops, manufactures, and markets product quality
   assurance systems, precision weighing and inspection equipment,
   electrochemistry and microweighing products, electronic test instruments,
   explosives-detection devices, and moisture analysis systems, as well as
   implantable heart-assist devices and other biomedical products. 

        Appendix A attached to this Amendment sets forth with respect to each
   executive officer and director of the Reporting Persons 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 Persons,
   there is no person who may be deemed to be a controlling person of the
   Reporting Persons (except that Thermo Electron may be deemed to control
   Thermedics by virtue of its majority ownership).
PAGE
<PAGE>






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

        During the last five years, neither the Reporting Persons nor (to the
   knowledge of the Reporting Persons) any executive officer or director of
   the Reporting Persons has been a party to a civil proceeding of a judicial
   or administrative body of competent jurisdiction which resulted in a
   judgment, 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.

        The Reporting Persons have expended approximately $11,509,100 in
   purchasing Shares of the Issuer since the date of their last filing on
   Schedule 13D.  These funds were paid out of the Reporting Persons' working
   capital.

   Item 4.  Purpose of Transaction

        Thermedics may make additional purchases of Shares or other securities
   of the Issuer in such manner and in such amounts as it determines to be
   appropriate in order to maintain at least 50% ownership of the Issuer.  The
   Reporting Persons may also make additional purchases of Shares or other
   securities of the Issuer in such manner and in such amounts as they
   determine to be appropriate for other purposes.  In determining whether to
   do so for other purposes, they will consider various relevant factors,
   including their 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 Persons 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 in Item 6, neither of the
   Reporting Persons nor, to the Reporting Persons' knowledge, any of the
   executive officers or directors of the Reporting Persons 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 Persons 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.

        (a)  The Shares beneficially owned by the Reporting Persons include
   7,916,424 Shares, or approximately 67.7% of the outstanding Shares, owned
   by Thermedics, and 228,200 Shares, or approximately 2.5% of the outstanding
   Shares, owned by Thermo Electron.  Of the 7,916,424 Shares beneficially
   owned by Thermedics, 2,465,089 Shares are issuable to Thermedics if it
   elects to convert in full its subordinated convertible debentures of the
PAGE
<PAGE>





   Issuer.  To the knowledge of the Reporting Persons, the executive officers
   and directors of the Reporting Persons beneficially own an aggregate of
   133,887 Shares or approximately 1.5% of the outstanding Shares.  To the
   knowledge of the Reporting Persons, the Shares beneficially owned by all
   executive officers and directors of the Reporting Persons include 105,298
   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 Persons who owns Shares is set forth
   below.

   Name                                 Number of Shares(1)
   ----                                 -------------------


   John M. Albertine                    1,500
   Peter O. Crisp                       2,250

   Paul F. Ferrari                      5,998
   Elias P. Gyftopoulos                 3,750
   John N. Hatsopoulos                  7,668

   Frank Jungers                        6,000
   Robert A. McCabe                     3,300
   Frank E. Morris                      1,500

   Donald E. Noble                      1,500
   Hutham S. Olayan                     1,500
   Roger D. Wellington                  1,500

   John W. Wood, Jr.                    95,171
   Nicholas T. Zervas                   2,250
   All directors and current executive  133,887
   officers as a group (23 persons)


   ________

   (1)  Shares reported as beneficially owned by Dr. Albertine, Mr. Crisp, Mr.
   Ferrari, Dr. Gyftopoulos, Mr. J. Hatsopoulos, Mr. Jungers, Mr. McCabe, Dr.
   Morris, Mr. Noble, Ms. Olayan, Mr. Wellington, Mr. Wood, Dr. Zervas and all
   directors and executive officers as a group include 1,500, 2,250, 5,998,
   3,750, 7,498, 1,500, 1,500, 1,500, 1,500, 1,500, 1,500, 78,450, 2,250 and
   105,298 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 Persons are
   also directors and officers of the Issuer, all such persons disclaim
   beneficial ownership of the Shares owned by the Reporting Persons.

        (b)  The Reporting Persons and the executive officers and directors of
   the Reporting Persons have the sole power to vote and dispose of the Shares
   each such person owns.  Thermo Electron owns more than 50% of the
   outstanding common stock of Thermedics and, therefore, may be deemed to
   have the power to vote and dispose of the Shares owned by Thermedics.
   However, Thermo Electron disclaims the existence of a group between itself
PAGE
<PAGE>





   and Thermedics for purposes of this Schedule 13D.  Shares beneficially
   owned by Ms. Hutham Olayan do not include 10,000 Shares owned by Crescent
   Growth Fund, Ltd., a member of the Olayan Group.  Crescent Growth Fund,
   Ltd. is indirectly controlled by Mr. Suliman S. Olayan, Ms. Olayan's
   father.  Ms. Olayan disclaims beneficial ownership of the Shares owned by
   Crescent Growth Fund, Ltd.

        (c)  During the past 60 days, the Reporting Persons effected the
   following transactions with respect to the Shares:

      Purchaser      Date    Amount  Price Per Share      Transfer Type


   Thermedics      3/17/97       400     $10.38      Purchase on Open Market

   Thermedics      3/19/97     3,300     $10.50      Purchase on Open Market

   Thermedics      3/24/97     5,800     $10.38      Purchase on Open Market

   Thermedics      3/25/97    12,500     $10.25      Purchase on Open Market

   Thermedics      3/26/97     5,800     $10.25      Purchase on Open Market

   Thermedics      3/27/97    15,800     $10.25      Purchase on Open Market

   Thermedics      3/31/97    22,500     $ 9.13      Purchase on Open Market

   Thermedics      4/1/97     21,700     $ 9.25      Purchase on Open Market

   Thermedics      4/2/97      3,300     $ 9.38      Purchase on Open Market

   Thermedics      4/2/97      2,900     $ 9.50      Purchase on Open Market

   Thermedics      4/3/97      6,200     $ 9.38      Purchase on Open Market

   Thermedics      4/4/97        700     $ 9.25      Purchase on Open Market

   Thermedics      4/4/97      5,500     $ 9.38      Purchase on Open Market

   Thermedics      4/7/97     15,800     $ 9.25      Purchase on Open Market

   Thermedics      4/8/97      4,800     $ 9.13      Purchase on Open Market

   Thermedics      4/9/97     11,500     $ 9.25      Purchase on Open Market

   Thermedics      4/10/97     2,800     $ 9.19      Purchase on Open Market

   Thermedics      4/11/97    12,300     $ 9.13      Purchase on Open Market

   Thermedics      4/14/97    16,000     $ 9.00      Purchase on Open Market

   Thermo Electron 4/17/97   100,000     $ 8.00      Purchase on Open Market


   To the knowledge of the Reporting Persons, no executive officer or director
   of the Reporting Persons has effected any transactions in Shares in the
   past 60 days.

        (c)  Not applicable.

        (d)  Not applicable.

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





        Of the 7,916,424 Shares beneficially owned by Thermedics, (i)
   2,465,089 Shares are issuable to Thermedics if it elects to convert in full
   its subordinated convertible debentures of the Issuer and (ii) 6,750 Shares
   are subject to options to acquire such Shares granted by Thermedics
   pursuant to its director and employee stock option plans.  Of the 228,200
   Shares beneficially owned by Thermo Electron, 31,496 Shares are subject to
   options to acquire such Shares granted by Thermo Electron pursuant to its
   director and employee stock option plans.  The executive officers and
   directors of the Reporting Persons have the right, pursuant to such
   options, to acquire 17,250 Shares.  In addition, the following executive
   officers and directors of the Reporting Persons have the right to acquire
   shares from the Issuer pursuant to the Issuer's director and employee stock
   option plans:  Mr. Elias P. Gyftopoulos  has the right to acquire 3,750
   Shares within 60 days; Mr. Paul F. Ferrari has the right to acquire 3,748
   Shares within 60 days; and Mr. John W. Wood, Jr. has the right to acquire
   80,550 Shares within 60 days.

        During 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 Common Stock 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 of the Common Stock 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 of the Issuer's Common Stock 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 options.

        During 1996, the Committee also established a stock holding policy for
   directors, including persons who are also directors or executive officers
   of the Reporting Persons (John W. Wood, Jr., John N. Hatsopoulos, and Elias
   P. Gyftopoulos).  The stock holding policy requires each director to hold a
   minimum of 1,000 shares of Common Stock.  

        In addition, the Committee adopted a policy requiring directors to
   hold shares of the Issuer's Common Stock 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
PAGE
<PAGE>





   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)       Agreement between the Issuer and Thermedics dated June 5,
   1992 for Purchase of Note (filed as Exhibit 4 to the Issuer's Current
   Report on Form 8-K dated June 5, 1992 [File No. 1-10574] and incorporated
   herein by reference).

        (ii)      Agreement between the Issuer and Thermedics dated August 2,
   1993 for Purchase of Note (filed as Exhibit 4.1 to the Issuer's Quarterly
   Report on Form 10-Q for the quarter ended July 3, 1993 [File No. 1-10574]
   and incorporated herein by reference).

        (iii)     1985 Stock Option Plan of the Issuer (filed as Exhibit 10.14
   to the Issuer's Annual Report on Form 10-K for the fiscal year ended June
   30, 1985 [File No. 0-8245] and incorporated herein by reference).

        (iv)      1990 Stock Option Plan, as amended, of the Issuer (filed as
   Exhibit 10.2 to the Issuer's Quarterly Report on Form 10-Q for the quarter
   ended July 2, 1994 [File No. 1-10574] and incorporated herein by
   reference).

        (v)       Equity Incentive Plan of the Issuer (filed as Exhibit 10.49
   to the Issuer's Annual Report on Form 10-K for the year ended December 31,
   1994 [File No. 1-11406] and incorporated herein by reference).

        (vi)      Directors Stock Option Plan of the Issuer (filed as Exhibit
   10.23 to the Issuer's Annual Report on Form 10-K for the year ended
   December 31, 1994 [File No. 1-11406] and incorporated herein by reference).

        (vii)     Amended and Restated Directors Stock Option Plan of Thermo
   Electron (filed as Exhibit 10.25 to Thermo Electron'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-Thermo Voltek Corp. Nonqualified
   Stock Option Plan (filed as Exhibit 10.17 to Thermo Electron's Annual
   Report on Form 10-K for the fiscal year ended January 2, 1993 [File No.
   1-8002] and incorporated herein by reference).

        (ix)      Directors Stock Option Plan of Thermedics (filed as Exhibit
   10.20 to Thermedics' Annual Report on Form 10-K for the fiscal year ended
   December 31, 1994 [File No. 1-9567] and incorporated herein by reference).

        (x)       Restated Stock Holding Assistance Plan and Form of
   Promissory Note (filed as Exhibit 10.24 to the Annual Report on Form 10-K
   of the Issuer for the fiscal year ended December 28, 1996 [File No.
   1-10574] and incorporated herein by reference).
PAGE
<PAGE>







   Signatures

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

   Date: June 13, 1997                     THERMO ELECTRON CORPORATION


                                      By:  /s/Sandra L. Lambert
                                           --------------------------
                                           Sandra L. Lambert
                                           Secretary


   Date: June 13, 1997                     THERMEDICS INC.

                                      By:  /s/Sandra L. Lambert
                                           --------------------------
                                           Sandra L. Lambert
                                           Secretary
PAGE
<PAGE>





   Signatures

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

   Date: June 13, 1997                     THERMO ELECTRON CORPORATION


                                      By:  /s/ Sandra L. Lambert
                                           ---------------------------
                                           Sandra L. Lambert
                                           Secretary


   Date: June 13, 1997                     THERMEDICS INC.

                                      By:  /s/ Sandra L. Lambert
                                           ---------------------------
                                           Sandra L. Lambert
                                           Secretary
PAGE
<PAGE>





                                   APPENDIX A
                                   ----------

        The following individuals are executive officers or directors of
   Thermo Electron Corporation ("Thermo Electron") and/or its subsidiary
   Thermedics Inc. ("Thermedics").  Unless otherwise noted, all such
   individuals are citizens of the United States.  Unless otherwise noted, the
   business address of each executive officer of Thermo Electron is Thermo
   Electron Corporation, 81 Wyman Street, Waltham, Massachusetts 02254-9046
   and the business address of each executive officer of Thermedics is
   Thermedics Inc., 470 Wildwood Street, Woburn, Massachusetts 01888.

   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
   ---------------
                                                Director, Thermedics

        Mr. Crisp is a General Partner of Venrock Associates, a venture
   capital investment firm.  His business address is Venrock, Inc., 30
   Rockefeller Plaza, New York, New York  10112.

   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 investments and acquisition services.  His business
   address is Pilot Capital Corporation, 444 Madison Avenue, Suite 2103, New
   York, New York 10022.

   Frank E. Morris:                             Director, Thermo Electron
   ----------------

        Dr. Morris served as the Peter Drucker Professor of Management at
   Boston College from 1989 to 1994.  Dr. Morris also served as President of
   the Federal Reserve Bank of Boston from 1968 until he retired in 1988.  His
   residential address is P.O. Box 825, 24 Sugarhouse Road, New London, New
   Hampshire 03257.
PAGE
<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.

   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.

   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.  His address is 5555 Gulf of
   Mexico Drive, Longboat Key, Florida 34228.

   Paul F. Ferrari:                             Director, Thermedics
   ----------------

        Mr. Ferrari has been a consultant to Thermo Electron since January
   1991.  Mr. Ferrari was a Vice President of Thermo Electron from 1988 until
   his retirement at the end of 1990, its Secretary from 1981 to 1990 and its
   Treasurer from 1967 to 1988.  He served as Thermedics' Clerk from 1983 to
   1990 and its Treasurer from 1983 to 1988.  His address is 8145 S. E.
   Woodlake Lane, Hobe Sound, Florida 33455.

   Robert C. Howard:                            Director, Thermedics
   -----------------

        Mr. Howard has been a Director of Thermedics since 1983.  Mr. Howard
   was an Executive Vice President of Thermo Electron from 1986 until his
   retirement in January, 1997.  His business address is Thermo Electron
   Corporation, 81 Wyman Street, Waltham, Massachusetts  02254-9046.

   Nicholas T. Zervas:                          Director, Thermedics
   -------------------

        Dr. Zervas has been Chief of Neurological Service, Massachusetts
   General Hospital, since 1977.  His business address is Massachusetts
   General Hospital, Neurosurgery Department, Boston, Massachusetts 02114.

   George N. Hatsopoulos:                       Director, Chairman of the
   ----------------------
                                                Board and Chief 
                                                Executive Officer,
                                                Thermo Electron
                                                Director, Thermedics
PAGE
<PAGE>






   John N. Hatsopoulos:                         President and Chief
   --------------------
                                                Financial Officer, 
                                                Thermo Electron
                                                Director, Chairman of the
                                                Board, Vice President and
                                                Chief Financial Officer,
                                                Thermedics

   Peter G. Pantazelos:                         Executive Vice President,
   --------------------
                                                Corporate Development,
                                                Thermo Electron

   Arvin H. Smith:                              Executive Vice President,
   ---------------
                                                Thermo Electron

   William A. Rainville:                        Senior Vice President,
   ---------------------
                                                Thermo Electron

   John W. Wood, Jr.:                           Senior Vice President,
   ------------------
                                                Thermo Electron
                                                Director, President and Chief
                                                Executive Officer, Thermedics

   Paul F. Kelleher:                            Senior Vice President, Finance
   -----------------
                                                & Administration and Chief
                                                Accounting Officer,
                                                Thermo Electron
                                                Chief Accounting Officer,
                                                Thermedics

   John T. Keiser:                              Director and Senior Vice
   ---------------
                                                President,
                                                Thermedics

   Victor L. Poirier:                           Senior Vice President,
   ------------------
                                                Thermedics

   Jeffrey J. Langan:                           Vice President,
   ------------------
                                                Thermedics

   David H. Fine:                               Vice President, Thermedics
   --------------






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