PERMA FIX ENVIRONMENTAL SERVICES INC
SC 13G/A, 1997-02-05
HAZARDOUS WASTE MANAGEMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                          (Amendment No.____3_______)*


                      Perma-Fix Environmental Services, Inc.
              -----------------------------------------------------
                                (Name of Issuer)

                      Common Stock, $.001 par value
          -------------------------------------------------------------
                         (Title of Class of Securities)

                                    714157104
              -----------------------------------------------------
                                 (CUSIP Number)



Check the following box if a fee is  being paid with this statement [ ].

(A fee is not required only if the filing person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

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

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

<PAGE>

CUSIP No. 714157104                   13G                    Page 2 of 5 Pages



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

       J. Morton Davis
       

- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION


       United States

- --------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES            667,952
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH             0
   REPORTING      --------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH             667,952
                  --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER
                       0

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


                      667,952
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                       X

- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


                       6.8%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*



                      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>
CUSIP No. 714157104                   13G                    Page 3 of 5 Pages



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

       D.H. Blair Investment Banking Corp.
       

- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION


       Delaware

- --------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES            0
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH             630,177
   REPORTING      --------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH             0
                  --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

                       630,177
- ----------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                       630,177

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

                        X

- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


                       6.4%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*
                     BD
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>

                                                        Page 4 of 5 Pages

Item 1.        J. Morton Davis and D.H. Blair Investment Banking Corp. 
               ("Blair Investment") (together, the "Reporting Parties"), 
               hereby amend their statement on Schedule 13G relating to the 
               Common Stock, $.001 par value ("shares") of Perma-Fix
               Environmental Services, Inc. (the "Issuer") as follows:
  

Item 2. (a) is hereby amended in its entirety as follows:

               J. Morton  Davis  and Blair  Investment  (1). See Exhibit A
               which  is a copy of  their  agreement  in  writing to file  this
               statement  on  behalf  of  each of them  (previously filed  in a
               Schedule 13G, dated February 14, 1996, of which this is
               Amendment No. 3 thereto, and incorporated by reference herein).


Item 2. (b) is hereby amended in its entirety as follows:

               Mr. Davis' and Blair Investment's business address is 44 Wall 
               Street, New York, New York  10005.


Item 2. (c) is hereby amended in its entirety as follows:

               Mr. Davis is a United States citizen.  Blair Investment is 
               incorporated in the State of Delaware. 

Item 4. is hereby amended in its entirety as follows:

    (a) (b) As of December 31, 1996, Mr. Davis may be deemed to 
            beneficially own 667,952 shares (2) or 6.8% of the Issuer's shares  
            as follows: (i) 206,701 shares owned by Blair Investment, (ii)
            206,701 shares underlying a warrant to purchase 206,701 shares
            at $2.15 per share through February 10, 1997 owned by Blair 
            Investment, (iii) 9,775 shares underlying a warrant to purchase 
            9,775 shares at $2.75 per share through August 31, 1999 owned 
            by Blair Investment, (iv) 7,000 shares underlying a warrant 
            to purchase 7,000 shares at $1.98 per share through August 31,
            1999 owned directly by Blair Investment, (v) 200,000 shares
            underlying a warrant to purchase 200,000 shares at $1.75 per share
            through September 15, 1999 owned directly by Blair Investment, (vi)
            9,775 shares underlying a warrant to purchase 9,775 shares at 
            $2.75 per share through August 31, 1999 owned directly by Mr. 
            Davis, and (vii) 28,000 shares underlying a warrant to purchase
            28,000 shares at $1.98 per share through August 31, 1999 owned
            directly by Mr. Davis. 

            As of December 31, 1996, Blair Investment may be deemed to 
            beneficially own 630,177 shares or 6.4% of the Issuer's shares as
            indicated in (i) - (v) above.

       (c)  Mr.  Davis  has sole  power to vote or to direct  the  vote,  to
            dispose or to direct the  disposition of those shares owned by Blair
            Investment and himself.

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

     (1) Mr.  Davis  is an  investment  banker  and  sole  shareholder  of Blair
Investment,  a  broker-dealer  registered  under the Securities  Exchange Act of
1934. Prior to May 1, 1996,  Blair Investment was a wholely-owned  subsidiary of
D.H. Blair  Holdings,  Inc.  ("Blair  Holdings"),  which was solely owned by Mr.
Davis.  As of May 1, 1996,  Blair Holdings  merged into Blair  Investment,  with
Blair Investment being the surviving corporation.

     (2) The number of shares  owned does not include  570,494  shares which are
beneficially  owned by Steve Gorlin and which are pledged to Mr. Davis and Blair
Investment pursuant to a Pledge Agreement dated June, 1992. The number of shares
owned also does not include  160,361  shares owned by Kinder  Investments,  L.P.
("Kinder").  Kenton E. Wood, the general partner of Kinder, is a stockholder of,
and  the  Chairman  and  Chief  Executive  Officer  of D.H.  Blair  & Co.,  Inc.
("Blair").  Certain limited  partners of Kinder are also  stockholders of Blair.
The limited partners of Kinder are the children and  grandchildren of Mr. Davis.
Blair  Investment and Mr. Davis disclaim for purposes of Section 13 or otherwise
beneficial  ownership of any shares owned by Kinder or Blair.  Kinder  disclaims
for purposes of Section 13 or otherwise beneficial ownership of any shares owned
by Blair, Blair Investment, or Mr. Davis.


<PAGE>
                                                            Page 5 of 5 pages

                                   Signature.


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


Date: February 4, 1997
      


By:   /s/ J. Morton Davis
   -------------------------------
      J. Morton Davis




Date: February 4, 1997

      D.H. Blair Investment Banking Corp.




By:  /s/ David Nachamie
   -------------------------------
     David Nachamie
     Treasurer 



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