THERMOTREX CORP
10-Q, 1998-05-14
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

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

                                    FORM 10-Q

    (mark one)

    [ X ] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
          Exchange Act of 1934 for the Quarter Ended April 4, 1998.

    [   ] Transition Report Pursuant to Section 13 or 15(d) of the
          Securities Exchange Act of 1934.

                         Commission File Number 1-10791

                             THERMOTREX CORPORATION
             (Exact name of Registrant as specified in its charter)

    Delaware                                                       52-1711436
    (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                        Identification No.)

    10455 Pacific Center Court
    San Diego, California                                          92121-4339
    (Address of principal executive offices)                       (Zip Code)

       Registrant's telephone number, including area code: (781) 622-1000

           Indicate by check mark whether the Registrant (1) has
           filed all reports required to be filed by Section 13
           or 15(d) of the Securities Exchange Act of 1934
           during the preceding 12 months (or for such shorter
           period that the Registrant was required to file such
           reports), and (2) has been subject to such filing
           requirements for the past 90 days. Yes [ X ] No [   ]

           Indicate the number of shares outstanding of each of
           the issuer's classes of Common Stock, as of the
           latest practicable date.

                    Class                    Outstanding at May 1, 1998
         ----------------------------        --------------------------
         Common Stock, $.01 par value                18,571,959
PAGE
<PAGE>
    PART I - FINANCIAL INFORMATION

    Item 1 - Financial Statements
    -----------------------------

                             THERMOTREX CORPORATION

                           Consolidated Balance Sheet
                                   (Unaudited)

                                     Assets


                                                     April 4,  September 27,
    (In thousands)                                       1998           1997
    ------------------------------------------------------------------------
    Current Assets:
      Cash and cash equivalents (includes $257,453
        and $91,164 under repurchase agreement with
        affiliated company)                          $260,796       $135,720
      Available-for-sale investments, at quoted
        market value (amortized cost of $17,167
        and $17,520)                                   17,174         17,499
      Accounts receivable, less allowances of
        $2,313 and $1,969                              69,888         58,632
      Unbilled contract costs and fees                  4,122          4,651
      Inventories:
        Raw materials and supplies                     28,035         27,860
        Work in process                                16,542         13,474
        Finished goods                                  7,819          6,870
      Prepaid expenses                                  4,679          3,422
      Prepaid income taxes                             11,387         11,877
                                                     --------       --------
                                                      420,442        280,005
                                                     --------       --------

    Property, Plant, and Equipment, at Cost            70,559         67,957
      Less: Accumulated depreciation and
            amortization                               17,890         15,568
                                                     --------       --------
                                                       52,669         52,389
                                                     --------       --------
    Notes Receivable from Related Parties (Note 2)      4,967          3,300
                                                     --------       --------
    Prepaid Income Taxes and Other Assets              16,375         13,831
                                                     --------       --------
    Cost in Excess of Net Assets of Acquired
      Companies (Note 6)                              108,410        100,592
                                                     --------       --------
                                                     $602,863       $450,117
                                                     ========       ========

                                        2PAGE
<PAGE>
                             THERMOTREX CORPORATION

                     Consolidated Balance Sheet (continued)
                                   (Unaudited)

                    Liabilities and Shareholders' Investment


                                                     April 4,  September 27,
    (In thousands except share amounts)                  1998           1997
    ------------------------------------------------------------------------
    Current Liabilities:
      Note payable to parent company                 $      -       $ 11,000
      Accounts payable                                 18,588         21,373
      Accrued payroll and employee benefits             7,037          8,863
      Accrued warranty costs                            6,283          6,299
      Accrued commissions                               6,169          3,922
      Payable for repurchase of subsidiary 
        common stock                                   10,000              -
      Other accrued expenses                           26,923         24,245
      Due to parent company and affiliated
        companies                                       2,000          2,027
                                                     --------       --------
                                                       77,000         77,729
                                                     --------       --------
    Long-term Obligations:
      3 1/4% Subordinated convertible debentures
        (includes $10,000 of related party
        debt; Note 3)                                 124,500              -
      4 3/8% Subordinated convertible debentures      115,000        115,000
                                                     --------       --------
                                                      239,500        115,000
                                                     --------       --------
    Deferred Lease Liability                            1,454          1,379
                                                     --------       --------
    Common Stock of Subsidiary Subject to
      Redemption                                       40,500         40,500
                                                     --------       --------
    Minority Interest                                  84,543         39,374
                                                     --------       --------

    Shareholders' Investment:
      Common stock, $.01 par value, 50,000,000
        shares authorized; 19,464,986 and
        19,251,769 shares issued                          195            193
      Capital in excess of par value                   63,379         78,601
      Retained earnings                               117,813         97,597
      Treasury stock at cost, 946,767 and
        8,747 shares                                  (21,525)          (243)
      Net unrealized gain (loss) on available-for-
        sale investments                                    4            (13)
                                                     --------       --------
                                                      159,866        176,135
                                                     --------       --------
                                                     $602,863       $450,117
                                                     ========       ========
    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        3PAGE
<PAGE>
                             THERMOTREX CORPORATION

                        Consolidated Statement of Income
                                   (Unaudited)


                                                      Three Months Ended
                                                   -----------------------
                                                   April 4,      March 29,
    (In thousands except per share amounts)            1998           1997
    ----------------------------------------------------------------------
    Revenues                                       $ 82,563       $ 70,079
                                                   --------       --------

    Costs and Operating Expenses:
      Cost of revenues                               52,907         46,778
      Selling, general, and administrative 
        expenses                                     20,769         16,944
      Research and development expenses               9,515          7,824
                                                   --------       --------
                                                     83,191         71,546
                                                   --------       --------

    Operating Loss                                     (628)        (1,467)
    Interest Income                                   3,654          1,183
    Interest Expense (includes $228 and $29 to
      related party)                                 (2,522)           (29)
    Gain on Issuance of Stock by Subsidiary 
      (Note 4)                                       23,798              -
    Equity in Losses of Joint Ventures                 (420)             -
                                                   --------       --------
    Income (Loss) Before Provision for Income
      Taxes and Minority Interest                    23,882           (313)
    Provision for Income Taxes                        3,712            250
    Minority Interest Expense (Income)                1,311           (751)
                                                   --------       --------
    Net Income                                     $ 18,859       $    188
                                                   ========       ========
    Earnings per Share (Note 5):
      Basic                                        $   1.02       $    .01
                                                   ========       ========
      Diluted                                      $    .83       $    .01
                                                   ========       ========
    Weighted Average Shares (Note 5):
      Basic                                          18,526         19,203
                                                   ========       ========
      Diluted                                        23,294         19,608
                                                   ========       ========


    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        4PAGE
<PAGE>
                             THERMOTREX CORPORATION

                        Consolidated Statement of Income
                                   (Unaudited)


                                                       Six Months Ended
                                                   -----------------------
                                                   April 4,      March 29,
    (In thousands except per share amounts)            1998           1997
    ----------------------------------------------------------------------
    Revenues                                       $168,118       $132,904
                                                   --------       --------

    Costs and Operating Expenses:
      Cost of revenues                              104,772         86,831
      Selling, general, and administrative
        expenses                                     41,161         31,808
      Research and development expenses              18,906         15,194
                                                   --------       --------
                                                    164,839        133,833
                                                   --------       --------

    Operating Income (Loss)                           3,279           (929)
    Interest Income                                   6,925          2,463
    Interest Expense (includes $557 and $59 to
      related party)                                 (4,755)           (59)
    Gain on Issuance of Stock by Subsidiary 
      (Note 4)                                       23,798          1,997
    Equity in Losses of Joint Ventures                 (820)             -
                                                   --------       --------
    Income Before Provision for Income Taxes and
      Minority Interest                              28,427          3,472
    Provision for Income Taxes                        6,022          1,227
    Minority Interest Expense (Income)                2,189           (706)
                                                   --------       --------
    Net Income                                     $ 20,216       $  2,951
                                                   ========       ========
    Earnings per Share (Note 5):
      Basic                                        $   1.08       $    .15
                                                   ========       ========
      Diluted                                      $    .93       $    .15
                                                   ========       ========
    Weighted Average Shares (Note 5):
      Basic                                          18,772         19,192
                                                   ========       ========
      Diluted                                        22,889         19,634
                                                   ========       ========


    The accompanying notes are an integral part of these consolidated
    financial statements.

                                        5PAGE
<PAGE>
                             THERMOTREX CORPORATION

                      Consolidated Statement of Cash Flows
                                   (Unaudited)


                                                        Six Months Ended
                                                     ---------------------
                                                     April 4,    March 29,
    (In thousands)                                       1998         1997
    ----------------------------------------------------------------------
    Operating Activities:
      Net income                                     $ 20,216     $  2,951
      Adjustments to reconcile net income to
        net cash used in operating activities:
          Depreciation and amortization                 6,962        3,930
          Provision for losses on accounts
            receivable                                    437          185
          Gain on issuance of stock by subsidiary
            (Note 4)                                  (23,798)      (1,997)
          Minority interest expense (income)            2,189         (706)
          Increase in long-term prepaid income 
            taxes                                      (1,050)           -
          Other                                           989          499
          Changes in current accounts, excluding
            the effects of acquisition:
              Accounts receivable                     (11,431)      (4,627)
              Inventories and unbilled contract
                costs and fees                         (3,353)     (10,307)
              Other current assets                       (747)      (2,443)
              Accounts payable                         (2,703)        (552)
              Other current liabilities                 2,362        8,731
                                                     --------     --------
    Net cash used in operating activities              (9,927)      (4,336)
                                                     --------     --------

    Investing Activities:
      Acquisition, net of cash acquired (Note 6)       (7,174)           -
      Purchases of available-for-sale investments      (4,000)           -
      Proceeds from sale and maturities of 
        available-for-sale investments                  4,400       29,500
      Purchases of property, plant, and equipment      (5,004)     (17,797)
      Advance pursuant to note receivable from
        related party (Note 2)                         (1,667)           -
      Investment in other assets                            -       (1,119)
      Other                                               (41)         567
                                                     --------     --------
    Net cash provided by (used in) investing
      activities                                     $(13,486)    $ 11,151
                                                     --------     --------
                                        6PAGE
<PAGE>
                             THERMOTREX CORPORATION

                Consolidated Statement of Cash Flows (continued)
                                   (Unaudited)


                                                        Six Months Ended
                                                    -----------------------
                                                    April 4,      March 29,
    (In thousands)                                      1998           1997
    -----------------------------------------------------------------------
    Financing Activities:
      Net proceeds from issuance of Company and
        subsidiary common stock and sale of
        subsidiary put options (Note 4)            $ 68,719         $  5,367
      Purchases of Company and subsidiary common
        stock                                       (28,810)          (2,179)
      Net proceeds from issuance of subordinated
        convertible debentures (Note 3)             121,814                -
      Repayment of note payable to parent company   (11,000)               -
      Payment of withholding taxes related to
        stock option exercises                       (2,234)          (1,018)
                                                   --------         --------
    Net cash provided by financing activities       148,489            2,170
                                                   --------         --------
    Increase in Cash and Cash Equivalents           125,076            8,985
    Cash and Cash Equivalents at Beginning of
      Period                                        135,720           43,940
                                                   --------         --------
    Cash and Cash Equivalents at End of Period     $260,796         $ 52,925
                                                   ========         ========
    Noncash Activities:
      Fair value of assets of acquired company     $  7,787         $      -
      Cash paid for acquired company                 (7,176)               -
                                                   --------         --------
        Liabilities assumed of acquired company    $    611         $      -
                                                   ========         ========


    The accompanying notes are an integral part of these consolidated
    financial statements.



                                        7PAGE
<PAGE>
                             THERMOTREX CORPORATION

                   Notes to Consolidated Financial Statements

    1.  General

        The interim consolidated financial statements presented have been
    prepared by ThermoTrex Corporation (the Company) without audit and, in
    the opinion of management, reflect all adjustments of a normal recurring
    nature necessary for a fair statement of the financial position at April
    4, 1998, the results of operations for the three- and six-month periods
    ended April 4, 1998, and March 29, 1997, and the cash flows for the
    six-month periods ended April 4, 1998, and March 29, 1997. The Company's
    results of operations for the six-month periods ended April 4, 1998, and
    March 29, 1997, include 27 weeks and 26 weeks, respectively. Interim
    results are not necessarily indicative of results for a full year.

        The consolidated balance sheet presented as of September 27, 1997,
    has been derived from the consolidated financial statements that have
    been audited by the Company's independent public accountants. The
    consolidated financial statements and notes are presented as permitted by
    Form 10-Q and do not contain certain information included in the annual
    financial statements and notes of the Company. The consolidated financial
    statements and notes included herein should be read in conjunction with
    the financial statements and notes included in the Company's Annual
    Report on Form 10-K for the fiscal year ended September 27, 1997, filed
    with the Securities and Exchange Commission.

    2.  Related-party Note Receivable

        In October 1997, the Company's ThermoLase Corporation subsidiary
    advanced $1.7 million to ThermoLase U.K. Limited pursuant to a note
    receivable, due December 31, 2003, and bearing interest at 8.0%, payable
    annually. ThermoLase U.K. Limited, a subsidiary of a joint venture that
    is 50%-owned by ThermoLase, is marketing ThermoLase's SoftLight(R) system
    in England.

    3.  Subordinated Convertible Debentures

        In November 1997, the Company issued and sold at par value $124.5
    million principal amount of 3 1/4% subordinated convertible debentures
    due 2007, including $10.0 million principal amount of such debentures
    sold to Thermo Electron Corporation, for net proceeds of $121.8 million.
    The debentures are convertible into shares of the Company's common stock
    at a conversion price of $27.00 per share and are guaranteed on a
    subordinated basis by Thermo Electron.

    4.  Issuance of Stock by Subsidiary

        In February 1998, the Company's Trex Medical Corporation subsidiary
    sold 5,175,000 shares of its common stock at $13.75 per share for net
    proceeds of $66.9 million, resulting in a gain of $23.8 million. At April
    4, 1998, the Company owned 67% of the outstanding common stock of Trex
    Medical.

                                        8PAGE
<PAGE>
                             THERMOTREX CORPORATION

    5.  Earnings per Share

        During the first quarter of fiscal 1998, the Company adopted
    Statement of Financial Accounting Standards No. 128, "Earnings per
    Share." As a result, all previously reported earnings per share have been
    restated; however, basic and diluted earnings per share equals the
    Company's previously reported earnings per share for the fiscal 1997
    periods presented. Basic earnings per share have been computed by
    dividing net income by the weighted average number of shares outstanding
    during the period. Diluted earnings per share have been computed assuming
    conversion of the Company's subordinated convertible debentures and the
    elimination of the related interest expense, and the exercise of stock
    options, and their related income tax effect. Basic and diluted earnings
    per share were calculated as follows:

                                 Three Months Ended     Six Months Ended
                                --------------------  --------------------
    (In thousands except        April 4,  March 29,    April 4,  March 29,
    per share amounts)              1998       1997        1998       1997
    ----------------------------------------------------------------------
    Basic
    Net income                   $18,859    $   188     $20,216    $ 2,951
                                 -------    -------     -------    -------
    Weighted average shares       18,526     19,203      18,772     19,192
                                 -------    -------     -------    -------
    Basic earnings per share     $  1.02    $   .01     $  1.08    $   .15
                                 =======    =======     =======    =======

    Diluted
    Net income                   $18,859    $   188     $20,216    $ 2,951
    Effect of:
      Convertible debentures         607          -       1,026          -
      Majority-owned
        subsidiaries' dilutive 
        securities                   (26)       (14)        (44)       (41)
                                 -------    -------     -------    -------
    Income available to common
      shareholders, as adjusted  $19,440    $   174     $21,198    $ 2,910
                                 -------    -------     -------    -------
    Weighted average shares       18,526     19,203      18,772     19,192
    Effect of:
      Convertible debentures       4,611          -       3,902          -
      Stock options                  157        405         215        442
                                 -------    -------     -------    -------
    Weighted average shares,
      as adjusted                 23,294     19,608      22,889     19,634
                                 -------    -------     -------    -------
    Diluted earnings per share   $   .83    $   .01     $   .93    $   .15
                                 =======    =======     =======    =======

        The computation of diluted earnings per share excludes the effect of
    assuming the exercise of certain outstanding stock options because the
    effect would be antidilutive. As of April 4, 1998, there were 373,500 of
    such options outstanding, with exercise prices ranging from $21.25 to
    $43.88 per share. 

                                        9PAGE
<PAGE>
                             THERMOTREX CORPORATION

    6.  Acquisition

        In October 1997, the Company's Trex Medical subsidiary acquired
    substantially all of the assets, subject to certain liabilities, of
    Digitec Corporation, a North Carolina-based manufacturer of
    physiological-monitoring equipment and digital-image archiving and
    networking systems used in cardiac catheterization procedures, for
    approximately $7.2 million in cash, subject to a post-closing adjustment.
    To date, no information has been gathered that would cause the Company to
    believe that such post-closing adjustment will be material. 

        The acquisition has been accounted for using the purchase method of
    accounting, and the results of operations have been included in the
    accompanying financial statements from the date of acquisition. The cost
    of this acquisition exceeded the estimated fair value of the acquired net
    assets by $7.1 million, which is being amortized over 15 years.
    Allocation of the purchase price was based on an estimate of the fair
    value of the net assets acquired and is subject to adjustment upon
    finalization of the purchase price allocation. Trex Medical has gathered
    no information that indicates the final allocation will differ materially
    from the preliminary estimates.

    7.  Subsequent Event

        On April 29, 1998, Trex Medical acquired the outstanding stock of
    Trophy Radiologie, a French manufacturer of dental and medical X-ray
    systems specializing in dental technology. The purchase price consists of
    approximately $25.0 million in cash and the repayment of approximately
    $10.0 million of net debt, subject to a post-closing adjustment to be
    based on the final determination of Trophy's book value at the date of
    acquisition, and additional consideration, which will not exceed
    approximately $8.0 million, if Trophy achieves certain future earnings
    targets.

    Item 2 - Management's Discussion and Analysis of Financial Condition and
    ------------------------------------------------------------------------
             Results of Operations
             ---------------------

        Forward-looking statements, within the meaning of Section 21E of the
    Securities Exchange Act of 1934, are made throughout this Management's
    Discussion and Analysis of Financial Condition and Results of Operations.
    For this purpose, any statements contained herein that are not statements
    of historical fact may be deemed to be forward-looking statements.
    Without limiting the foregoing, the words "believes," "anticipates,"
    "plans," "expects," "seeks," "estimates," and similar expressions are
    intended to identify forward-looking statements. There are a number of
    important factors that could cause the results of the Company to differ
    materially from those indicated by such forward-looking statements,
    including those detailed under the heading "Forward-looking Statements"
    in Exhibit 13 to the Company's Annual Report on Form 10-K for the fiscal
    year ended September 27, 1997, filed with the Securities and Exchange
    Commission.

                                       10PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Overview

        The Company operates in three business segments: Medical Products
    manufactured by the Company's Trex Medical Corporation subsidiary,
    Personal-care Products and Services offered by the Company's ThermoLase
    Corporation subsidiary, and Advanced Technology Research, including the
    laser communications research performed by the Company's Trex
    Communications Corporation subsidiary.

        Trex Medical designs, manufactures, and markets mammography equipment
    and minimally invasive digital breast-biopsy systems, general-purpose
    X-ray equipment, and specialized X-ray equipment, including imaging
    systems used during diagnostic and interventional vascular and cardiac
    procedures such as balloon angioplasty. Trex Medical sells its systems
    worldwide principally through a network of independent dealers, and also
    acts as an original equipment manufacturer (OEM) for other medical
    equipment companies. Until April 1998, Trex Medical had four operating
    units: Lorad, a manufacturer of mammography and digital breast-biopsy
    systems; Bennett X-Ray Corporation (Bennett), a manufacturer of
    general-purpose X-ray and mammography equipment; XRE Corporation (XRE), a
    manufacturer of X-ray imaging systems used in the diagnosis and treatment
    of coronary artery disease and other vascular conditions; and Continental
    X-Ray Corporation (Continental), a manufacturer of general-purpose and
    specialized X-ray systems. In April 1998, Trex Medical acquired the
    outstanding stock of Trophy Radiologie, a French manufacturer of dental
    and medical X-ray systems specializing in dental technology.

        ThermoLase has developed a laser-based system called SoftLight(R) for
    the removal of unwanted hair. The SoftLight system uses a low-energy,
    dermatology laser in combination with a lotion that absorbs the laser's
    energy to disable hair follicles. In April 1995, the Company received
    clearance from the U.S. Food and Drug Administration (FDA) to
    commercially market hair-removal services using the SoftLight system.
    ThermoLase began earning revenue from the SoftLight system in the first
    quarter of fiscal 1996 as a result of opening its first commercial
    location (Spa Thira) in November 1995. ThermoLase opened a total of four
    spas during fiscal 1996, opened nine additional spas during fiscal 1997,
    and opened its fourteenth spa in October 1997. Rather than continuing to
    open additional Spa Thira locations, ThermoLase presently intends to
    concentrate its resources on attempting both to increase the capacity
    utilization of its existing spas and to expand its physicians' licensing
    program and international licensing arrangements, discussed below.

        In June 1996, ThermoLase commenced a program to license to physicians
    and others the right to perform the Company's patented SoftLight
    hair-removal procedure. In this program, ThermoLase licenses its
    technology and receives a one-time fee and a per-procedure royalty that
    varies depending on the anatomical site treated and pricing plan selected
    by the client. ThermoLase also provides the licensees with the lasers and
    lotion that are necessary to perform the service. 


                                       11PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Overview (continued)

        ThermoLase experienced a decrease in revenues from its hair-removal
    services during the second quarter of fiscal 1998, as discussed in the
    results of operations below. In response to this trend, in April 1998
    ThermoLase significantly reduced the prices in its Spa Thira locations
    for its single- and multiple-treatment plans and similarly changed the
    pricing terms of its physicians' licensing program to reduce the
    per-procedure royalty paid by the physician-licensees, in an attempt to
    establish an optimum price point that will result in increased demand and
    higher revenues. In April 1998, as part of its effort to improve
    profitability, ThermoLase also initiated an effort to amend the existing
    agreements with its physician-licensees to include certain monthly
    minimum royalties, and will require such minimums with its new
    physician-licensees. Although not all licensees have responded,
    approximately 30% of those responding have declined to accept these new
    terms, which may result in the termination or restructuring of these
    licenses by ThermoLase. There can be no assurance that the strategies
    described above will be successful.

        ThermoLase is marketing the SoftLight system internationally through
    joint ventures and other licensing arrangements. In January 1996,
    ThermoLase established a joint venture in Japan. During fiscal 1997,
    ThermoLase established joint ventures in France in November 1996 and
    England in September 1997, and six additional licensing arrangements: in
    Saudi Arabia in November 1996; in Tunisia and Belgium in December 1996;
    in the United Arab Emirates and Oman in March 1997; in Switzerland in
    April 1997; in Brazil in June 1997; and in the United Kingdom (excluding
    England) and the Republic of Ireland in September 1997. In December 1997,
    the Company established a joint venture to market the SoftLight system in
    Australia, Cyprus, Germany, Greece, New Zealand, South Africa, and Spain.
    ThermoLase's international arrangements resulted in the opening of spas
    in Paris in May 1997 and in Lugano, Switzerland, in October 1997.

        ThermoLase plans to continue research and development as it seeks to
    improve the efficacy and duration of its hair-removal treatment, and
    believes that such improvements are critical elements in its ability to
    improve the profitability of its business.

        In March 1997, ThermoLase filed with the FDA a 510(k) application
    seeking clearance to market cosmetic skin-resurfacing services utilizing
    its SoftLight Rejuvenation(TM) Laser, including wrinkle and skin-texture
    treatment. This technology, which uses the same laser as ThermoLase's
    hair-removal system, is designed to improve the skin's appearance and
    texture. Following discussions with the FDA in December 1997, ThermoLase
    submitted additional data in February 1998 and focused on claims related
    to skin texture rather than wrinkle treatment, in order to expedite
    clearance of the application.

        ThermoLase also manufactures and markets skin-care, bath, and body
    products through its CBI Laboratories, Inc. subsidiary, which also
    manufactures the lotion used in the SoftLight hair-removal process.

                                       12PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Overview (continued)

        The Company's Advanced Technology Research segment performs research
    primarily in the fields of communications, avionics, X-ray detection,
    signal processing, and lasers. The Company has developed its expertise in
    these core technologies in connection with government-sponsored research
    and development. The Advanced Technology Research segment includes the
    Company's Trex Communications subsidiary, which is developing a laser
    communications (lasercom) technology, designed to move very large amounts
    of data quickly via lasers without the need for wires or licensing from
    the Federal Communications Commission. In addition, Trex Communications'
    Computer Communications Specialists, Inc. (CCS) subsidiary designs and
    markets interactive information and voice-response systems, as well as
    call-automation systems.

        The Company conducts all of its manufacturing operations, other than
    those of Trex Medical's Trophy subsidiary, in the United States and
    distributes its products, services, and technologies worldwide. The
    Company anticipates that an increasing portion of its revenues will be
    from sales to customers outside the United States. Although the Company
    seeks to charge its customers in the same currency as its operating
    costs, the Company's financial performance and competitive position can
    be affected by currency exchange rate fluctuations affecting the
    relationship between the U.S. dollar and foreign currencies. The Company
    may use forward contracts to reduce its exposure to currency
    fluctuations.

    Results of Operations

    Second Quarter Fiscal 1998 Compared With Second Quarter Fiscal 1997
    -------------------------------------------------------------------

        Total revenues increased 18% to $82.6 million in the second quarter
    of fiscal 1998 from $70.1 million in the second quarter of fiscal 1997.
    Medical Products segment revenues, excluding intersegment sales,
    increased 21% to $66.1 million in fiscal 1998 from $54.7 million in
    fiscal 1997, primarily due to increased sales at all of Trex Medical's
    existing operations. Revenues increased at XRE primarily due to increased
    demand for its cardiac catheterization laboratories, including a $6.7
    million sale to a Russian customer. Revenues at Lorad increased as a
    result of increased demand for breast-biopsy systems, mammography system
    upgrade components, and mobile X-ray systems. To a lesser extent,
    revenues increased as a result of increased demand for Continental's
    digital radiographic/fluoroscopic systems and Bennett's mammography
    systems.

        Personal-care Products and Services segment revenues decreased to
    $8.1 million in the second quarter of fiscal 1998 from $11.7 million in
    the second quarter of fiscal 1997. ThermoLase earned revenues from
    hair-removal services and related activities of $2.9 million in fiscal
    1998, compared with $5.2 million in fiscal 1997. The decrease in revenues
    resulted in part from reduced demand at ThermoLase's Spa Thira locations,
    offset in part by an increase in the number of U.S. spas to 14, compared
    with 10 spas open during fiscal 1997. Revenues from ThermoLase's
    physicians' licensing program decreased slightly in fiscal 1998 compared 

                                       13PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Second Quarter Fiscal 1998 Compared With Second Quarter Fiscal 1997
    -------------------------------------------------------------------
    (continued)

    with fiscal 1997, primarily due to a decrease in one-time fees as a
    result of a decrease in new physician-licensees, offset in part by an
    increase in the number of physician-licensees producing per-procedure
    royalties in fiscal 1998. As discussed in the accompanying overview, in
    April 1998 ThermoLase significantly reduced the prices for its single-
    and multiple-treatment plans and changed the pricing terms of its
    physicians' licensing program. Revenues in fiscal 1998 also decreased as
    a result of the inclusion in fiscal 1997 of $1.3 million of minimum
    guaranteed payments recorded upon granting technology rights under
    ThermoLase's international licensing arrangements. The amount of minimum
    guaranteed payments recorded by ThermoLase will vary depending on its
    ability to enter into additional international licensing arrangements,
    the availability of additional territories, and the terms of any such
    arrangements. Revenues at CBI decreased to $5.2 million in fiscal 1998
    from $6.5 million in fiscal 1997. A portion of CBI's revenues are derived
    from sales to large retailers, which have a relatively long buying cycle
    that results in periodic variations in revenues. In addition, CBI's
    revenues in fiscal 1998 were negatively impacted as a result of a shift
    by certain of its retail customers away from health- and beauty-aid
    sales.

        Advanced Technology Research segment revenues, excluding intersegment
    sales, increased to $8.4 million in the second quarter of fiscal 1998
    from $3.7 million in the second quarter of fiscal 1997. Revenues
    increased $3.2 million due to the inclusion of product revenues from CCS,
    acquired in July 1997.

        The gross profit margin was 36% in the second quarter of fiscal 1998,
    compared with 33% in the second quarter of fiscal 1997. The Medical
    Products segment gross profit margin, excluding intersegment sales,
    increased to 42% in fiscal 1998 from 37% in fiscal 1997, primarily due to
    increased sales of higher-margin products at all of Trex Medical's
    operations. To a lesser extent, the gross profit margin at Trex Medical
    increased due to margin improvements resulting from manufacturing
    efficiencies, primarily at Continental and Bennett. The Company's total
    gross profit margin also increased due to the inclusion of higher-margin
    revenues at CCS. The Personal-care Products and Services segment gross
    profit margin, excluding intersegment eliminations, was negative 13% in
    fiscal 1998, compared with 19% in fiscal 1997. ThermoLase's hair-removal
    business reported gross profit of negative $2.7 million in fiscal 1998,
    compared with gross profit of $0.1 million in fiscal 1997. Each period
    was impacted by the operations of the Spa Thira business, which has been
    operating below maximum capacity as ThermoLase seeks to develop its
    client base, expand its product lines, and refine its process and
    operating procedures, offset in part by the effect of physicians'
    licensing fees and, in fiscal 1997, minimum guaranteed payments relating
    to international licensing arrangements, which have a relatively high
    gross profit margin. In addition, fiscal 1997 was negatively impacted by
    pre-opening costs incurred in connection with new spa openings. The gross
    profit margin decreased in fiscal 1998 primarily due to the decrease in
    revenues from international licensing arrangements and the Spa Thira 

                                       14PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Second Quarter Fiscal 1998 Compared With Second Quarter Fiscal 1997
    -------------------------------------------------------------------
    (continued)

    locations, as well as increased fixed costs associated with operating
    more spas and supporting more physician-licensees in fiscal 1998. During
    the remainder of fiscal 1998, the effect of operating each spa below
    maximum capacity, as ThermoLase seeks to develop its client base and
    expand its product lines, will continue to have a negative impact on its
    gross profit margin. ThermoLase believes that improvements in the
    efficacy and duration of the SoftLight process, as well as increased spa
    utilization through broadening the array of spa-related services and
    products offered, are critical elements in its ability to improve the
    profitability of its spas. The degree to which ThermoLase's recent
    pricing structure changes are successful will also affect the Company's
    gross profit margin. The gross profit margin at CBI declined to 31% in
    fiscal 1998 from 33% in fiscal 1997, as a result of a continued shift to
    lower-margin products and a decrease in revenues.

        Selling, general, and administrative expenses as a percentage of
    revenues was 25% in the second quarter of fiscal 1998, compared with 24%
    in the second quarter of fiscal 1997, primarily due to the effect of the
    acquisition of CCS, which has higher costs as a percentage of revenues,
    as well as an increase in costs as a percentage of revenues in the
    Personal-care Products and Services segment, due to a decrease in
    revenues. These increases were offset in part by an increase in the
    relative size of the Medical Products segment, which has lower expenses
    as a percentage of revenues. Research and development expenses increased
    to $9.5 million in the second quarter of fiscal 1998 from $7.8 million in
    the second quarter of fiscal 1997, primarily due to increased spending at
    Trex Medical and the inclusion of $0.6 million of expense at CCS,
    acquired in July 1997, offset in part by a decrease in spending at
    ThermoLase. Trex Medical's increase in spending, primarily at XRE and
    Lorad, reflects its continued efforts to develop and commercialize new
    products, including the full-field digital mammography system and
    direct-detection X-ray sensor, as well as enhancements of existing
    systems. ThermoLase's decrease in spending related primarily to a
    reduction in the number of outside testing facilities and consultants
    used, as well as a reduction in payroll costs. ThermoLase continues to
    seek to improve the efficacy and duration of the SoftLight process as
    well as to develop its SoftLight Rejuvenation Laser skin treatment and
    investigate other health and beauty applications for its proprietary
    laser technology.

        Interest income increased to $3.7 million in the second quarter of
    fiscal 1998 from $1.2 million in the second quarter of fiscal 1997,
    primarily due to interest income earned on the invested proceeds from the
    Company's November 1997 issuance of $124.5 million principal amount of 
    3 1/4% subordinated convertible debentures (Note 3), ThermoLase's August
    1997 issuance of $115.0 million principal amount of 4 3/8% subordinated
    convertible debentures, and Trex Medical's February 1998 sale of
    5,175,000 shares of its common stock for net proceeds of $66.9 million
    (Note 4). Interest expense increased to $2.5 million in fiscal 1998 from
    $29,000 in fiscal 1997, primarily due to the August and November 1997
    issuances of subordinated convertible debentures.

                                       15PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Second Quarter Fiscal 1998 Compared With Second Quarter Fiscal 1997
    -------------------------------------------------------------------
    (continued)

        The Company has adopted a strategy of spinning out certain of its
    businesses into separate subsidiaries and having these subsidiaries sell
    a minority interest to outside investors. The Company believes that this
    strategy provides additional motivation and incentives for the management
    of the subsidiaries through the establishment of subsidiary-level stock
    option incentive programs, as well as capital to support the
    subsidiaries' growth. As a result of the sale of stock by Trex Medical,
    the Company recorded a gain on issuance of stock by subsidiary of $23.8
    million in the second quarter of fiscal 1998 (Note 4). The size and
    timing of these transactions are dependent on market and other conditions
    that are beyond the Company's control. In addition, in October 1995, the
    Financial Accounting Standards Board (FASB) issued an exposure draft of a
    Proposed Statement of Financial Accounting Standards, "Consolidated
    Financial Statements: Policy and Procedures" (the Proposed Statement).
    The Proposed Statement would establish new rules for how consolidated
    financial statements should be prepared. If the Proposed Statement is
    adopted, there would be significant changes in the way the Company
    records certain transactions of its controlled subsidiaries. Among those
    changes, any sale of the stock of a subsidiary that does not result in a
    loss of control would be accounted for as a transaction in the equity of
    the consolidated entity with no gain or loss being recorded. The FASB
    continues to deliberate on this issue and the timing and contents of any
    final statement are uncertain. Accordingly, there can be no assurance
    that the Company will be able to realize gains from such transactions in
    the future.

        Equity in losses of joint ventures in the accompanying statement of
    income represents ThermoLase's proportionate share of losses from its
    international joint ventures.

        Minority interest expense was $1.3 million in the second quarter of
    fiscal 1998, compared with minority interest income of $0.8 million in
    the second quarter of fiscal 1997, primarily due to the Company's
    inability to record minority interest income in ThermoLase's net loss,
    because the Company's minority interest liability related to ThermoLase
    has been reduced to zero. In addition, minority interest expense
    increased in fiscal 1998 due to an increase in Trex Medical's net income.

        The effective tax rate was below the statutory federal income tax
    rate in the second quarter of fiscal 1998 primarily due to a nontaxable
    gain on the issuance of stock by subsidiary, offset in part by the impact
    of state income taxes and certain nondeductible expenses, including
    amortization of cost in excess of net assets of acquired companies. In
    addition, the effective tax rate in fiscal 1998 reflects the
    establishment of a valuation allowance against the tax benefit associated
    with losses arising at ThermoLase during the second quarter of fiscal
    1998. The Company establishes valuation allowances in accordance with the
    provisions of Statement of Financial Accounting Standards No. 109,
    "Accounting for Income Taxes." Management believes that sufficient
    uncertainty exists regarding the timing of the realizability of the tax 

                                       16PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Second Quarter Fiscal 1998 Compared With Second Quarter Fiscal 1997
    -------------------------------------------------------------------
    (continued)

    benefit for losses arising during the quarter at ThermoLase that a
    valuation allowance is required. The effective tax rate exceeded the
    statutory federal income tax rate in the second quarter of fiscal 1997
    primarily due to the impact of state income taxes and nondeductible
    amortization of cost in excess of net assets of acquired companies. 

        Trex Medical is defending claims in an arbitration proceeding in
    which Continuum Electro-Optronics, Inc. is seeking approximately $1.4
    million in alleged lost profits under a contract it had with Trex
    Medical's Lorad division to sell laser components to Trex Medical.
    Although Trex Medical believes it has adequate defenses to such claims
    there can be no assurance as to the outcome of the arbitration.

        The Company is currently assessing the potential impact of the year
    2000 on the processing of date-sensitive information by the Company's
    computerized information systems and on products sold as well as products
    purchased by the Company. The Company believes that its internal
    information systems and current products are either year 2000 compliant
    or will be so prior to the year 2000 without incurring material costs.
    There can be no assurance, however, that the Company will not experience
    unexpected costs and delays in achieving year 2000 compliance for its
    internal information systems and current products, which could result in
    a material adverse effect on the Company's future results of operations.

        The Company is presently assessing the effect that the year 2000
    problem may have on its previously sold products. The Company is also
    assessing whether its key suppliers are adequately addressing this issue
    and the effect this might have on the Company. The Company has not
    completed its analysis and is unable to conclude at this time that the
    year 2000 problem as it relates to its previously sold products and
    products purchased from key suppliers is not reasonably likely to have a
    material adverse effect on the Company's future results of operations.

    First Six Months Fiscal 1998 Compared With First Six Months Fiscal 1997
    -----------------------------------------------------------------------

        Total revenues increased 26% to $168.1 million in the first six
    months of fiscal 1998 from $132.9 million in the first six months of
    fiscal 1997. Medical Products segment revenues, excluding intersegment
    sales, increased 23% to $129.8 million in fiscal 1998 from $105.7 million
    in fiscal 1997, primarily due to increased sales at all of Trex Medical's
    existing operations, due to the reasons described in the results of
    operations for the second quarter. In addition, Medical Products segment
    revenues increased $1.5 million due to the inclusion of revenues from
    Digitec, acquired in October 1997 (Note 6).

        Personal-care Products and Services segment revenues increased to
    $21.5 million in the first six months of fiscal 1998 from $20.3 million
    in the first six months of fiscal 1997. ThermoLase earned revenues from
    hair-removal services and related activities of $9.9 million in fiscal
    1998, compared with $7.7 million in fiscal 1997. The increase in revenues

                                       17PAGE
<PAGE>



                             THERMOTREX CORPORATION

    First Six Months Fiscal 1998 Compared With First Six Months Fiscal 1977
    -----------------------------------------------------------------------
    (continued)

    resulted in part from an increase in the number of U.S. spas to 14,
    compared with 10 spas open during fiscal 1997. Revenues from ThermoLase's
    physicians' licensing program also increased in fiscal 1998, primarily
    due to an increase in the number of physician-licensees producing
    per-procedure royalties in fiscal 1998, offset in part by a decrease in
    one-time fees as a result of a decrease in new physician-licensees. In
    addition, revenues from hair-removal services and related activities in
    fiscal 1998 included $2.8 million of minimum guaranteed payments recorded
    upon granting technology rights under ThermoLase's international
    licensing arrangements, compared with $1.6 million in fiscal 1997.
    Revenues at CBI decreased to $11.6 million in fiscal 1998 from $12.6
    million in fiscal 1997, due to the reasons described in the results of
    operations for the second quarter.

        Advanced Technology Research segment revenues, excluding intersegment
    sales, increased to $16.8 million in the first six months of fiscal 1998
    from $6.9 million in the first six months of fiscal 1997. Revenues
    increased $7.2 million due to the inclusion of product revenues from CCS,
    acquired in July 1997.

        The gross profit margin was 38% in the first six months of fiscal
    1998, compared with 35% in the first six months of fiscal 1997. The
    Medical Products segment gross profit margin, excluding intersegment
    sales, increased to 42% in fiscal 1998 from 38% in fiscal 1997, primarily
    due to the reasons discussed in the results of operations for the second
    quarter. The Company's total gross profit margin also increased due to
    the inclusion of higher-margin revenues at CCS. The Personal-care
    Products and Services segment gross profit margin, excluding intersegment
    eliminations, was 12% in fiscal 1998, compared with 20% in fiscal 1997.
    ThermoLase's hair-removal business reported gross profit of negative $1.0
    million in fiscal 1998, compared with gross profit of negative $0.1
    million in fiscal 1997. Each period was impacted by the operations of the
    Spa Thira business, which has been operating below maximum capacity as
    ThermoLase seeks to develop its client base, expand its product lines,
    and refine its process and operating procedures, offset in part by the
    effect of physicians' licensing fees and minimum guaranteed payments
    relating to international licensing arrangements, which have a relatively
    high gross profit margin. In addition, fiscal 1997 was negatively
    impacted by pre-opening costs incurred in connection with new spa
    openings. The gross profit margin decreased in fiscal 1998 primarily due
    to the decrease in revenues from ThermoLase's Spa Thira locations, as
    well as increased fixed costs associated with operating more spas in
    fiscal 1998, offset in part by the increase in higher-margin revenues
    from international licensing arrangements. The gross profit margin at CBI
    declined to 31% in fiscal 1998 from 33% in fiscal 1997, due to the
    reasons described in the results of operations for the second quarter.


                                       18PAGE
<PAGE>
                             THERMOTREX CORPORATION

    First Six Months Fiscal 1998 Compared With First Six Months Fiscal 1997
    -----------------------------------------------------------------------
    (continued)

        Selling, general, and administrative expenses as a percentage of
    revenues was 24% in both periods. An increase due to the effect of the
    acquisition of CCS, which has higher costs as a percentage of revenues,
    was offset in part by an increase in the relative size of the Medical
    Products segment, which has lower expenses as a percentage of revenues.
    Research and development expenses increased to $18.9 million in 1998 from
    $15.2 million in 1997, primarily due to the reasons described in the
    results of operations for the second quarter, including the impact of
    $1.2 million of expense due to the acquisition of CCS.

        Interest income increased to $6.9 million in the first six months of
    1998 from $2.5 million in the first six months of 1997, primarily due to 
    interest income earned on the invested proceeds from the Company's
    November 1997 issuance of $124.5 million principal amount of 3 1/4%
    subordinated convertible debentures (Note 3) and ThermoLase's August 1997
    issuance of $115.0 million principal amount of 4 3/8% subordinated
    convertible debentures. Interest expense increased to $4.8 million in
    1998 from $0.1 million in 1997, primarily due to reason described in the
    results of operations for the second quarter.
        During the first six months of fiscal 1998 and fiscal 1997, the
    Company recorded gains of $23.8 million and $2.0 million, respectively,
    from the issuance of stock by subsidiaries in connection with sales of
    Trex Medical common stock (Note 4).

        Equity in losses of joint ventures in the accompanying statement of
    income represents ThermoLase's proportionate share of losses from its
    international joint ventures.

        Minority interest expense was $2.2 million in the first six months of
    fiscal 1998, compared with minority interest income of $0.7 million in
    the first six months of fiscal 1997, primarily due to the reasons
    described in the results of operations for the second quarter.

        The effective tax rate differed from the statutory federal income tax
    rate in the first six months of fiscal 1998 primarily due to a nontaxable
    gain on the issuance of stock by subsidiary, offset in part by the impact
    of state income taxes and certain nondeductible expenses, including
    amortization of cost in excess of net assets of acquired companies. In
    addition, the effective tax rate for the first six months of fiscal 1998
    reflects the establishment of a valuation allowance against the tax
    benefit associated with losses arising at ThermoLase during the second
    quarter of fiscal 1998. Management believes that sufficient uncertainty
    exists regarding the timing of the realizability of the tax benefit for
    such losses that a valuation allowance is required.


                                       19PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Liquidity and Capital Resources

        Consolidated working capital was $343.4 million at April 4, 1998,
    compared with $202.3 million at September 27, 1997. Included in working
    capital are cash, cash equivalents, and available-for-sale investments of
    $278.0 million at April 4, 1998, compared with $153.2 million at
    September 27, 1997. Of the $278.0 million balance at April 4, 1998,
    $179.3 million was held by the Company's majority-owned subsidiaries, and
    the remainder was held by the Company and its wholly owned subsidiary.

        Net cash used in operating activities during the first six months of
    fiscal 1998 was $9.9 million. An increase in accounts receivable,
    primarily at Trex Medical, used $11.4 million of cash. The increase in
    accounts receivable at Trex Medical was primarily due to increased sales
    and, to a lesser extent, a shift from OEM sales to direct and dealer
    sales at XRE and slower customer payment patterns as a result of
    increased export sales at Bennett. The Company used $3.4 million of cash
    during the period to fund an increase in inventories, primarily to
    support an increase in sales at Trex Medical.

        Excluding available-for-sale investments activity, the Company's
    primary investing activities during the first six months of fiscal 1998
    included capital expenditures. The Company expended $5.0 million for
    property, plant, and equipment.

        In connection with certain of ThermoLase's joint venture
    arrangements, ThermoLase provided funding of $1.7 million during the
    first six months of fiscal 1998 (Note 2). ThermoLase has agreed to
    provide additional funding of up to approximately $5.4 million under
    these arrangements.

        The Company's financing activities provided $148.5 million of cash
    during the first six months of fiscal 1998. In November 1997, the Company
    sold at par value $124.5 million principal amount of 3 1/4% subordinated
    convertible debentures due 2007 for net proceeds of $121.8 million 
    (Note 4). The Company used a portion of such proceeds to repay in January
    1998 an $11.0 million note payable to Thermo Electron. In February 1998,
    the Company's Trex Medical subsidiary sold 5,175,000 shares of its common
    stock in a public offering at $13.75 per share, for net proceeds of $66.9
    million.

        In April 1998, Trex Medical acquired Trophy for approximately $25.0
    million in cash and the repayment of approximately $10.0 million of net
    debt, subject to a post-closing adjustment and additional consideration,
    which will not exceed approximately $8.0 million, if Trophy achieves
    certain future earnings targets. Trex Medical financed the acquisition
    with a portion of the proceeds from its February 1998 sale of common
    stock.


                                       20PAGE
<PAGE>
                             THERMOTREX CORPORATION

    Liquidity and Capital Resources (continued)

        Trex Communications has signed two non-binding letters of intent to
    acquire two companies for aggregate consideration of $9.8 million in cash
    and Trex Communications common stock valued at $11.2 million. The
    proposed acquisitions are subject to certain conditions, including
    completion of due diligence and negotiation of definitive agreements, as
    well as approval by the Company's board of directors and the stockholders
    of the potential acquirees. The final terms of such acquisitions have not
    been determined and there can be no assurance that these acquisitions
    will be completed.

        In November 1997, the Company's Board of Directors authorized the
    repurchase by the Company of up to $20.0 million of its common stock,
    through November 1998, in the open market or in negotiated transactions.
    During the first six months of fiscal 1998, the Company repurchased
    878,652 shares of its common stock for $20.0 million. In March 1998, the
    Company's board of directors authorized the repurchase by the Company of
    up to 2,000,000 shares of ThermoLase common stock in the open market or
    through negotiated transactions. During the first six months of fiscal
    1998, the Company purchased 2,000,000 shares of ThermoLase common stock
    for $10.0 million, which amount is reflected in payable for repurchase of
    subsidiary common stock in the accompanying fiscal 1998 balance sheet,
    and was paid during the third quarter of fiscal 1998. During the first
    six months of fiscal 1998, ThermoLase repurchased 643,000 shares of its
    common stock for $8.8 million.

        ThermoLase's capital expenditures during the remainder of fiscal 1998
    will primarily be affected by the number of physicians and other domestic
    and international licensees engaged in its licensing programs. In
    addition to expenditures by ThermoLase, the Company plans to make capital
    additions of approximately $3.8 million for its other businesses during
    the remainder of fiscal 1998. The Company expects that it will finance
    growth at its majority-owned and wholly owned subsidiaries through a
    combination of internal funds, additional debt or equity financing,
    and/or short-term borrowings from Thermo Electron, although it has no
    agreement to ensure that funds will be available from Thermo Electron on
    acceptable terms or at all. The Company believes its existing resources
    are sufficient to meet the capital requirements of its existing
    operations for the foreseeable future.



                                       21PAGE
<PAGE>
                             THERMOTREX CORPORATION

    PART II - OTHER INFORMATION

    Item 1 - Legal Proceedings
    --------------------------

        On April 7, 1998, Fischer Imaging Corporation commenced a lawsuit in
    the United States District Court, District of Colorado, against Trex
    Medical, alleging that its manufacture of breast-imaging equipment and
    breast-biopsy systems incorporating a digital imaging system, including
    Lorad's prone breast-biopsy system, infringe a Fischer patent entitled
    Motorized Mammographic Biopsy Apparatus, which issued April 7, 1998. This
    lawsuit is the second patent lawsuit filed by Fischer against the Company
    with respect to the breast-biopsy system. The suit requests a permanent
    injunction, treble damages, attorneys' fees, and expenses.

    Item 4 - Submission of Matters to a Vote of Security Holders
    ------------------------------------------------------------

        On March 5, 1998, at the Annual Meeting of Shareholders, the
    shareholders elected seven incumbent directors to a one-year term
    expiring in 1999. The Directors elected at the meeting were: Mr. Morton
    Collins, Mr. Peter O. Crisp, Mr. Paul F. Ferrari, Dr. George N.
    Hatsopoulos, Mr. Robert C. Howard, Mr. Gary S. Weinstein, and Dr.
    Nicholas T. Zervas. Messrs. Crisp, Ferrari, Howard, and Weinstein and Dr.
    Zervas each received 15,316,523 shares voted in favor of his election and
    58,747 shares voted against. Mr. Collins received 15,316,223 shares voted
    in favor of his election and 59,047 shares voted against. Dr. Hatsopoulos
    received 15,316,123 shares voted in favor of his election and 59,147
    shares voted against. No abstentions or broker nonvotes were recorded on
    the election of directors.

    Item 6 - Exhibits
    -----------------

        See Exhibit Index on the page immediately preceding exhibits.





                                       22PAGE
<PAGE>
                             THERMOTREX CORPORATION

                                   SIGNATURES


        Pursuant to the requirements of the Securities Exchange Act of 1934,
    the Registrant has duly caused this report to be signed on its behalf by
    the undersigned thereunto duly authorized as of the 13th day of May 1998.

                                           THERMOTREX CORPORATION



                                           Paul F. Kelleher
                                           ---------------------------
                                           Paul F. Kelleher
                                           Chief Accounting Officer



                                           John N. Hatsopoulos
                                           ---------------------------
                                           John N. Hatsopoulos
                                           Chief Financial Officer and
                                             Senior Vice President












                                       23PAGE
<PAGE>
                             THERMOTREX CORPORATION

                                  EXHIBIT INDEX


    Exhibit
    Number        Description
    ------------------------------------------------------------------------

    4.3            First Supplemental Indenture dated as of February 6, 1998,
                   by and among the Company, Thermo Electron Corporation, and
                   Bankers' Trust Company, as trustee.

    27             Financial Data Schedule for the quarter ended April 4,  
                   1998.

    27.1           Financial Data Schedule for the quarter ended December
                   30, 1995 (restated for the adoption of SFAS No. 128).

    27.2           Financial Data Schedule for the quarter ended March 30,
                   1996 (restated for the adoption of SFAS No. 128).

    27.3           Financial Data Schedule for the quarter ended June 29,
                   1996 (restated for the adoption of SFAS No. 128).

    27.4           Financial Data Schedule for the year ended September 28,
                   1996 (restated for the adoption of SFAS No. 128).

    27.5           Financial Data Schedule for the quarter ended June 28,
                   1997 (restated for the adoption of SFAS No. 128).

    27.6           Financial Data Schedule for the year ended September 27,  
                   1997 (restated for the adoption of SFAS No. 128).




                                                              Exhibit 4.3


                          FIRST SUPPLEMENTAL INDENTURE


             FIRST  SUPPLEMENTAL  INDENTURE  (this  "First   Supplemental
        Indenture") dated as of February 6, 1998, by and among ThermoTrex
        Corporation,  a  Delaware  corporation  (the  "Issuer"),   Thermo
        Electron Corporation,  a Delaware  corporation (the  "Guarantor")
        and Bankers Trust  Company, a New  York banking corporation  (the
        "Trustee").

             WHEREAS, the  Issuer, the  Guarantor  and the  Trustee  have
        entered into that certain Indenture dated as of October 28,  1997
        (the "Indenture"), with respect to  the issuance and sale of  the
        Issuer's subordinated debt securities (the "Securities"); and

             WHEREAS, Article  Twelve of  the Indenture  ("Conversion  of
        Securities") contains provisions  permitting the  Issuer, in  its
        sole discretion, to (i) pay cash  in respect of all or a  portion
        of the shares of the common  stock, $.01 par value per share,  of
        the Issuer  (the  "Common  Stock") otherwise  issuable  upon  the
        conversion of  the  Securities  (the  "Cash  Settlement  Option")
        and/or (ii) deliver fully paid  and non-assessable shares of  the
        common stock, $1.00 par value per share, of the Guarantor in lieu
        of issuing  shares of  Common Stock  upon the  conversion of  the
        Securities (the "Stock Settlement Option"); and

             WHEREAS, the Board of Directors of the Issuer has determined
        that the Cash Settlement Option  and the Stock Settlement  Option
        do not serve any desired purpose of the Issuer; and
         
             WHEREAS, the  Issuer and  the  Guarantor have  the  ability,
        pursuant to Section 901 of the Indenture, to amend the  Indenture
        to  remove  both  the  Cash  Settlement  Option  and  the   Stock
        Settlement Option, upon  the authorization of  such amendment  by
        the Boards of Directors  of the Issuer  and the Guarantor,  which
        authorization has been received; and

             WHEREAS, as required  by Section 903  of the Indenture,  the
        Issuer and the Guarantor  have provided the  Trustee with (i)  an
        Opinion of Counsel of the  Issuer and the Guarantor stating  that
        the execution of this First Supplemental Indenture is  authorized
        by the Indenture  and (ii) Officers'  Certificates of the  Issuer
        and the Guarantor  stating that all  conditions precedent to  the
        execution  of  this  First   Supplemental  Indenture  have   been
        fulfilled;

             NOW, THEREFORE, in consideration of the foregoing and  other
        good and valuable consideration,  the receipt and sufficiency  of
        which are  hereby  acknowledged,  the  parties  hereto  agree  as
        follows:

             1.   The Issuer shall no longer have the ability to exercise
        either the Cash Settlement Option or the Stock Settlement  Option
        with respect to any Securities issued pursuant to the Indenture.
PAGE
<PAGE>
             2.   This First Supplemental Indenture shall form a part  of
        the Indenture for all  purposes, and every  Holder of a  Security
        authenticated and delivered  pursuant to  the Indenture  (whether
        before or after the date hereof) shall be bound hereby.

             3.   Except as amended by this First Supplemental Indenture,
        the Indenture shall  continue in  full force and  effect and  the
        Indenture is in all respects hereby ratified and confirmed.

             4.   In  case  any  provision  of  this  First  Supplemental
        Indenture  shall  be  invalid,  illegal  or  unenforceable,   the
        validity, legality and enforceability of the remaining provisions
        hereof and of the Indenture shall  not be in any way affected  or
        impaired.

             5.   This First Supplemental  Indenture may  be executed  in
        any number of counterparts,  each of which  so executed shall  be
        deemed to  be  an  original,  but  all  such  counterparts  shall
        together constitute but one and the same instrument.

             6.   All capitalized terms defined in the Indenture and used
        herein without definition shall have the same meanings herein  as
        are ascribed to them in the Indenture.

             IN WITNESS  WHEREOF, the  parties  hereto have  caused  this
        First Supplemental Indenture to be  duly executed as of the  date
        first above written.

                                           THERMOTREX CORPORATION


                                           ------------------------------
                                           By:  Melissa F. Riordan
                                           Its:  Treasurer


                                           THERMO ELECTRON CORPORATION


                                           ------------------------------
                                           By:  John N. Hatsopoulos
                                           Its:  President and Chief
                                                 Financial Officer


                                           BANKERS TRUST COMPANY

                                           ------------------------------
                                           By: Sandra J. Shaffer
                                           Its: Assistant Vice President


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED APRIL 4, 1998
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          OCT-03-1998
<PERIOD-END>                               APR-04-1998
<CASH>                                         260,796
<SECURITIES>                                    17,174
<RECEIVABLES>                                   72,201
<ALLOWANCES>                                     2,313
<INVENTORY>                                     52,396
<CURRENT-ASSETS>                               420,442
<PP&E>                                          70,559
<DEPRECIATION>                                  17,890
<TOTAL-ASSETS>                                 602,863
<CURRENT-LIABILITIES>                           77,000
<BONDS>                                        229,500
                                0
                                          0
<COMMON>                                           195
<OTHER-SE>                                     159,671
<TOTAL-LIABILITY-AND-EQUITY>                   602,863
<SALES>                                        168,118
<TOTAL-REVENUES>                               168,118
<CGS>                                          104,772
<TOTAL-COSTS>                                  104,772
<OTHER-EXPENSES>                                18,906
<LOSS-PROVISION>                                   437
<INTEREST-EXPENSE>                               4,755
<INCOME-PRETAX>                                 28,427
<INCOME-TAX>                                     6,022
<INCOME-CONTINUING>                             20,216
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    20,216
<EPS-PRIMARY>                                     1.08
<EPS-DILUTED>                                      .93
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED DECEMBER 30, 
1995 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          SEP-28-1996
<PERIOD-END>                               DEC-30-1995
<CASH>                                          37,545
<SECURITIES>                                    67,416
<RECEIVABLES>                                   29,877
<ALLOWANCES>                                     1,244
<INVENTORY>                                     21,962
<CURRENT-ASSETS>                               163,767
<PP&E>                                          19,855
<DEPRECIATION>                                   6,413
<TOTAL-ASSETS>                                 253,069
<CURRENT-LIABILITIES>                           42,340
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           191
<OTHER-SE>                                     176,622
<TOTAL-LIABILITY-AND-EQUITY>                   253,813
<SALES>                                         39,560
<TOTAL-REVENUES>                                43,095
<CGS>                                           23,214
<TOTAL-COSTS>                                   26,332
<OTHER-EXPENSES>                                 4,799
<LOSS-PROVISION>                                   104
<INTEREST-EXPENSE>                                 122
<INCOME-PRETAX>                                 15,725
<INCOME-TAX>                                     1,519
<INCOME-CONTINUING>                             14,172
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    14,172
<EPS-PRIMARY>                                      .74
<EPS-DILUTED>                                      .72
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED MARCH 30, 1996
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-28-1996
<PERIOD-END>                               MAR-30-1996
<CASH>                                          48,801
<SECURITIES>                                    57,224
<RECEIVABLES>                                   30,072
<ALLOWANCES>                                     1,156
<INVENTORY>                                     23,295
<CURRENT-ASSETS>                               168,485
<PP&E>                                          22,105
<DEPRECIATION>                                   6,971
<TOTAL-ASSETS>                                 257,043
<CURRENT-LIABILITIES>                           44,346
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           191
<OTHER-SE>                                     177,914
<TOTAL-LIABILITY-AND-EQUITY>                   257,043
<SALES>                                         79,010
<TOTAL-REVENUES>                                85,794
<CGS>                                           45,994
<TOTAL-COSTS>                                   51,481
<OTHER-EXPENSES>                                10,301
<LOSS-PROVISION>                                   159
<INTEREST-EXPENSE>                                 238
<INCOME-PRETAX>                                 19,550
<INCOME-TAX>                                     3,082
<INCOME-CONTINUING>                             16,275
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    16,275
<EPS-PRIMARY>                                      .85
<EPS-DILUTED>                                      .83
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORP.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 29, 1996 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          SEP-28-1996
<PERIOD-END>                               JUN-29-1996
<CASH>                                          20,800
<SECURITIES>                                    59,503
<RECEIVABLES>                                   28,957
<ALLOWANCES>                                     1,356
<INVENTORY>                                     31,999
<CURRENT-ASSETS>                               151,100
<PP&E>                                          29,302
<DEPRECIATION>                                   7,673
<TOTAL-ASSETS>                                 265,904
<CURRENT-LIABILITIES>                           54,323
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           191
<OTHER-SE>                                     177,317
<TOTAL-LIABILITY-AND-EQUITY>                   265,904
<SALES>                                        128,566
<TOTAL-REVENUES>                               128,566
<CGS>                                           77,222
<TOTAL-COSTS>                                   77,222
<OTHER-EXPENSES>                                15,913
<LOSS-PROVISION>                                   285
<INTEREST-EXPENSE>                                 351
<INCOME-PRETAX>                                 22,080
<INCOME-TAX>                                     4,366
<INCOME-CONTINUING>                             17,346
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,346
<EPS-PRIMARY>                                      .91
<EPS-DILUTED>                                      .88
        




</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED SEPTEMBER 28, 1996
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-28-1996
<PERIOD-END>                               SEP-28-1996
<CASH>                                          43,940
<SECURITIES>                                    51,701
<RECEIVABLES>                                   38,201
<ALLOWANCES>                                     1,586
<INVENTORY>                                     37,303
<CURRENT-ASSETS>                               184,334
<PP&E>                                          40,535
<DEPRECIATION>                                   9,031
<TOTAL-ASSETS>                                 320,222
<CURRENT-LIABILITIES>                           56,471
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           192
<OTHER-SE>                                     204,887
<TOTAL-LIABILITY-AND-EQUITY>                   320,222
<SALES>                                        169,669
<TOTAL-REVENUES>                               182,029
<CGS>                                          101,967
<TOTAL-COSTS>                                  112,245
<OTHER-EXPENSES>                                24,986
<LOSS-PROVISION>                                   336
<INTEREST-EXPENSE>                                 464
<INCOME-PRETAX>                                 48,292
<INCOME-TAX>                                     5,341
<INCOME-CONTINUING>                             42,575
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    42,575
<EPS-PRIMARY>                                     2.23
<EPS-DILUTED>                                     2.16
        




</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 28, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          SEP-27-1997
<PERIOD-END>                               JUN-28-1997
<CASH>                                          38,267
<SECURITIES>                                     6,986
<RECEIVABLES>                                   49,828
<ALLOWANCES>                                     1,767
<INVENTORY>                                     47,817
<CURRENT-ASSETS>                               158,847
<PP&E>                                          64,386
<DEPRECIATION>                                  13,619
<TOTAL-ASSETS>                                 319,535
<CURRENT-LIABILITIES>                           61,281
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           192
<OTHER-SE>                                     177,005
<TOTAL-LIABILITY-AND-EQUITY>                   319,535
<SALES>                                        205,835
<TOTAL-REVENUES>                               205,835
<CGS>                                          133,068
<TOTAL-COSTS>                                  133,068
<OTHER-EXPENSES>                                23,544
<LOSS-PROVISION>                                   266
<INTEREST-EXPENSE>                                  70
<INCOME-PRETAX>                                  3,664
<INCOME-TAX>                                     1,603
<INCOME-CONTINUING>                              3,236
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,236
<EPS-PRIMARY>                                      .17
<EPS-DILUTED>                                      .16
        



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMOTREX
CORPORATION'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED SEPTEMBER 27, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-27-1997
<PERIOD-END>                               SEP-27-1997
<CASH>                                         135,720
<SECURITIES>                                    17,499
<RECEIVABLES>                                   60,601
<ALLOWANCES>                                     1,969
<INVENTORY>                                     48,204
<CURRENT-ASSETS>                               280,005
<PP&E>                                          67,957
<DEPRECIATION>                                  15,568
<TOTAL-ASSETS>                                 450,117
<CURRENT-LIABILITIES>                           77,729
<BONDS>                                        115,000
                                0
                                          0
<COMMON>                                           193
<OTHER-SE>                                     175,942
<TOTAL-LIABILITY-AND-EQUITY>                   450,117
<SALES>                                        265,947
<TOTAL-REVENUES>                               282,121
<CGS>                                          168,469
<TOTAL-COSTS>                                  180,136
<OTHER-EXPENSES>                                33,467
<LOSS-PROVISION>                                   279
<INTEREST-EXPENSE>                                 835
<INCOME-PRETAX>                                 10,618
<INCOME-TAX>                                     3,474
<INCOME-CONTINUING>                              8,441
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,441
<EPS-PRIMARY>                                      .44
<EPS-DILUTED>                                      .43
        



</TABLE>


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