OEC MEDICAL SYSTEMS INC
SC 13D/A, 1999-05-13
X-RAY APPARATUS & TUBES & RELATED IRRADIATION APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                            OEC Medical Systems, Inc.
                                (Name of Issuer)

                          Common Stock, $0.01 Par Value
                         (Title of Class of Securities)

                                    670828102
                                 (CUSIP Number)

                              Mara H. Rogers, Esq.
                           Fulbright & Jaworski L.L.P.
                                666 Fifth Avenue
                             New York, NY 10103-3198
                                 (212) 318-3000
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                   May 3, 1999
             (Date of Event Which Requires Filing of This Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing   this   schedule   because  of   ss.ss.240.13d-1(e),   240.13d-1(f)   or
240.13d-1(g), check the following box |x|.

     Note.  Schedules  filed in paper format shall include a signed original and
five copies of the Schedule,  including all exhibits.  See  ss.240.13d-7(b)  for
other parties to whom copies are to be sent.

                                          (Continued on following pages)

                                               (Page 1 of 9 Pages)
- ------------------
         * The  remainder of this cover page shall be filled out for a reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

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

<PAGE>



CUSIP No.  670828102            13D                          Page 2 of 9 Pages



    1     Names of Reporting Persons
          I.R.S. Identification Nos. of Above Persons (Entities Only)

          Forstmann-Leff Associates Inc.
          13-3131718

    2     Check the Appropriate Box if a Member of a Group*
                                (a) [ ]

                                (b) [ ]

    3     SEC Use Only


    4     Source of Funds*
          OO

    5     Check Box if Disclosure of Legal  Proceedings is Required  Pursuant to
          Items 2(d) or 2(e) [ ]


    6     Citizenship or Place of Organization

          New York
                                7    Sole Voting Power
        NUMBER OF                    236,020 shares
          SHARES
       BENEFICIALLY             8    Shared Voting Power
         OWNED BY                    2,788,200 shares
           EACH
        REPORTING               9    Sole Dispositive Power
          PERSON                     243,835 shares
           WITH
                               10    Shared Dispositive Power
                                     2,794,100 shares

   11     Aggregate Amount Beneficially Owned by Each Reporting Person

          3,037,935 shares (includes shares  beneficially  owned by FLA Advisers
          L.L.C.,  FLA Asset  Management  Inc. and Stamford  Advisers  Corp.)

   12     Check if the Aggregate Amount in Row (11) Excludes Certain Shares*
                                 [ ]

   13     Percent of Class Represented by Amount in Row (11)
          23.8%

   14     Type of Reporting Person*
          IA, CO

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP No.  670828102            13D                          Page 3 of 9 Pages



   1     Names of Reporting Persons
         I.R.S. Identification Nos. of Above Persons (Entities Only)

         FLA Advisers L.L.C.
         13-3942422
   2     Check the Appropriate Box if a Member of a Group*
                               (a) [ ]

                               (b) [ ]
   3     SEC Use Only


   4     Source of Funds*
         OO

   5     Check Box if Disclosure of Legal  Proceedings  is Required  Pursuant to
         Items 2(d) or 2(e) [ ]

   6     Citizenship or Place of Organization

         New York
                                7    Sole Voting Power
        NUMBER OF                    None
          SHARES
       BENEFICIALLY             8    Shared Voting Power
         OWNED BY                    2,788,090 shares
           EACH
        REPORTING               9    Sole Dispositive Power
          PERSON                     None
           WITH
                               10    Shared Dispositive Power
                                     2,788,090 shares


  11     Aggregate Amount Beneficially Owned by Each Reporting Person

          2,788,090  shares  (includes  shares  beneficially  owned by  Stamford
          Advisers Corp.)

  12      Check if the Aggregate  Amount in Row (11) Excludes Certain Shares*
                                  [ ]

  13     Percent of Class Represented by Amount in Row (11)
         21.9%

  14     Type of Reporting Person*
         IA, OO

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


CUSIP No.  670828102            13D                          Page 4 of 9 Pages



   1     Names of Reporting Persons
         I.R.S. Identification Nos. of Above Persons (Entities Only)

         FLA Asset Management Inc.
         13-29256626

   2     Check the Appropriate Box if a Member of a Group*
                               (a) [ ]

                               (b) [ ]

   3     SEC Use Only


   4     Source of Funds*
         OO

   5     Check Box if Disclosure of Legal  Proceedings  is Required  Pursuant to
         Items 2(d) or 2(e) [ ]

   6     Citizenship or Place of Organization

         Delaware
                                7    Sole Voting Power
        NUMBER OF                    None
          SHARES
       BENEFICIALLY             8    Shared Voting Power
         OWNED BY                    7,700 shares
           EACH
        REPORTING               9    Sole Dispositive Power
          PERSON                     None
           WITH
                               10    Shared Dispositive Power
                                     13,600 shares


  11     Aggregate Amount Beneficially Owned by Each Reporting Person
         13,600 shares

  12     Check if the Aggregate Amount in Row (11) Excludes Certain Shares*
                                [ ]

  13     Percent of Class Represented by Amount in Row (11)
         0.1%

  14     Type of Reporting Person*
         IA, CO

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>

CUSIP No.  670828102            13D                          Page 5 of 9 Pages



   1     Names of Reporting Persons
         I.R.S. Identification Nos. of Above Persons (Entities Only)

         Stamford Advisers Corp.
         13-3421433

   2     Check the Appropriate Box if a Member of a Group* 
                               (a) [ ]

                               (b) [ ]

   3     SEC Use Only


   4     Source of Funds*
         OO

   5     Check Box if Disclosure of Legal  Proceedings  is Required  Pursuant to
         Items 2(d) or 2(e) [ ]

   6     Citizenship or Place of Organization

         New York
                                       7      Sole Voting Power
            NUMBER OF                         None
             SHARES
          BENEFICIALLY                 8      Shared Voting Power
            OWNED BY                          24,700 shares
              EACH
            REPORTING                  9      Sole Dispositive Power
             PERSON                            None
              WITH
                                      10      Shared Dispositive Power
                                              24,700 shares

  11     Aggregate Amount Beneficially Owned by Each Reporting Person
         24,700 shares

  12     Check if the Aggregate Amount in Row (11) Excludes Certain Shares*
                                [ ]

  13     Percent of Class Represented by Amount in Row (11)
         0.2%

  14     Type of Reporting Person*

         IA, CO
- -------  ------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>
                                Page 6 of 9 Pages


Preliminary Note


     This  Amendment No. 1 ("Amendment  No. 1") amends the Statement on Schedule
13D ("Schedule 13D") filed on April 1, 1999 by  Forstmann-Leff  Associates Inc.,
FLA Advisers L.L.C.  ("FLA  Advisers"),  FLA Asset  Management Inc. and Stamford
Advisers  Corp.(collectively,  the "reporting  persons"),  with respect to their
beneficial  ownership  of common  stock,  par value $0.01 per share (the "Common
Stock") of OEC Medical  Systems,  Inc. (the  "Issuer").  This Amendment No. 1 is
being filed to report that,  as  indicated in Item 5(d),  effective as of May 3,
1999,  the  interest in the Common  Stock of the Issuer of one of FLA  Advisers'
clients,  FLA International Fund, Ltd., a Bermuda investment company,  increased
to more than five percent of the total  outstanding  Common Stock of the Issuer.
There has been no change in the  information  set forth in the  Schedule  13D in
response to Items 1, 2, 4 and 6 of the Schedule  13D.  Accordingly,  those items
are omitted from this  Amendment  No. 1.  Capitalized  terms used herein and not
defined herein have the meaning ascribed thereto in the Schedule 13D.

Item 3.  Source and Amount of Funds or Other Consideration

     Since the filing of the Schedule 13D, Forstmann-Leff Associates,  Inc. used
funds  derived from  clients'  assets  under  management  at an aggregate  cost,
including  brokerage  commissions,  of  $76,072.50,  to purchase 3,150 shares of
Common Stock of the Issuer.


<PAGE>

                                Page 7 of 9 Pages



Item 5.  Interest in the Securities of the Issuer

(a)      See Items 11 and 13 of the cover pages attached hereto.

(b)      See Items 7, 8, 9 and 10 of the cover pages attached hereto.

(c)      Since the  filing  of the  Schedule  13D,  the  following  transactions
         involving  the  Issuer's  Common Stock were  effected by the  reporting
         persons:

     On April 20, 1999,  Forstmann-Leff  Associates Inc. purchased in the open
market 510 shares of the Issuer's Common Stock at a price per share of $25.25.

   On May 3, 1999,  Forstmann-Leff  Associates Inc. purchased in the open market
2,640 shares of the Issuer's Common Stock at a price per share of $23.94.


(d) Various  clients of the  reporting  persons have the right to receive or the
power to direct the receipt of dividends from, or the proceeds from the sale of,
the Common Stock of the Issuer.  No one client's interest in the Common Stock of
the Issuer is more than five  percent  of the total  outstanding  Common  Stock,
other than for FLA International Fund, Ltd., a Bermuda investment company, which
holds a 5.6% interest in the Common Stock of the Issuer. This Amendment No. 1 is
being filed to report that, effective as of May 3, 1999, FLA International Fund,
Ltd.'s  interest in the Common  Stock of the Issuer  increased to more than five
percent of the total outstanding Common Stock of the Issuer.

(e)      Not applicable.

         The  number  of  shares  beneficially  owned  by each of the  reporting
persons and the percentage of outstanding shares represented thereby,  have been
computed in  accordance  with Rule 13d-3 under the  Securities  Exchange  Act of
1934, as amended.  The ownership of the reporting persons is based on 12,753,477
outstanding shares of the Issuer's Common Stock as of March 1, 1998, as reported
in the Issuer's  Annual  Report on Form 10-K for the fiscal year ended  December
31, 1998,  as filed with the  Securities  and Exchange  Commission  on March 25,
1999.


Item 7.  Materials to be Filed as Exhibits

         Exhibit A.  Agreement of Joint Filing.




<PAGE>

                                Page 8 of 9 Pages

                                   SIGNATURES


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

May 10, 1999

                                                  FORSTMANN-LEFF ASSOCIATES INC.


                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                     Executive Vice President



                                                  FLA ADVISERS L.L.C.


                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                         Managing Member


                                                  FLA ASSET MANAGEMENT INC.

                                                   By: /s/ Peter A. Lusk
                                                           Peter A. Lusk
                                                    Executive Vice President

                                                  STAMFORD ADVISERS CORP.


                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                           President



<PAGE>
                                Page 9 of 9 Pages

                                                                       Exhibit A

                            AGREEMENT OF JOINT FILING

         The undersigned,  Forstmann-Leff  Associates Inc., FLA Advisers L.L.C.,
FLA Asset Management Inc. and Stamford Advisers Corp., hereby agree to the joint
filing  with all other  reporting  persons  (as such term is defined in Schedule
13D) of a statement on Schedule 13D or any amendments  thereto,  with respect to
the  Common  Stock of OEC  Medical  Systems,  Inc.  and that this  Agreement  be
included as an Exhibit to such filing made on their behalf.

         This  Agreement may be executed in any number of  counterparts  each of
which  shall be  deemed to be an  original  and all of which  together  shall be
deemed to constitute one and the same agreement.

         IN WITNESS  WHEREOF,  the undersigned  hereby execute this Agreement on
the 10th day of May, 1999.

                                                  FORSTMANN-LEFF ASSOCIATES INC.

                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                    Executive Vice President


                                                  FLA ADVISERS L.L.C.

                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                         Managing Member


                                                  FLA ASSET MANAGEMENT INC.

                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                        Executive Vice President


                                                  STAMFORD ADVISERS CORP.

                                                  By: /s/ Peter A. Lusk
                                                          Peter A. Lusk
                                                            President

<PAGE>



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