UNIT INSTRUMENTS INC
SC 13D, 1998-12-08
INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL
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                                  UNITED STATES
                        SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

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

                             Unit Instruments, Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    90921C100
                                 (CUSIP Number)

                                Vicki Z. Holleman
                          c/o Loeb Partners Corporation
                  61 Broadway, N.Y., N.Y., 10006 (212) 483-7047

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

                                December 2, 1998

             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of Rule 13d-1(b)(3) or (4), check the following box [ ]. Check
the  following  box if a fee is being  paid  with  statement  [ ]. (A fee is not
required only if the following reporting person: (1) has a previous statement on
file  reporting  beneficial  ownership of more than five percent of the class of
securities  described  is 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.)

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.  *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  remained  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>


                                  SCHEDULE 13D

CUSIP NO. 90921C100

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

          Loeb Partners Corporation

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

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

         WC, O

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

NUMBER OF         7  SOLE VOTING POWER
SHARES               13,616 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY             10,438 Shares of Common stock
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            13,616 Shares of Common stock
PERSON WITH      10  SHARED DISPOSITIVE POWER
                     10,438 Shares of Common stock

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         24,054 Shares of Common stock

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

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.6%

14 TYPE OF REPORTING PERSON*
         PN, BD, IA

<PAGE>


                                  SCHEDULE 13D
CUSIP NO. 90921C100

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

          Loeb Arbitrage Fund

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

                                                                         (b) [ ]
3  SEC USE ONLY

4  SOURCE OF FUNDS

         WC, O

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            [  ]
     PURSUANT TO ITEMS 2(d) or 2(e)

6  CITIZENSHIP OR PLACE OF ORGANIZATION

         New York

NUMBER OF         7  SOLE VOTING POWER
SHARES               190,787 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY               -----
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            190,787 Shares of Common stock
PERSON WITH       10 SHARED DISPOSITIVE POWER
                       -----

11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           190,787 Shares of Common stock

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

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
           4.78%

14 TYPE OF REPORTING PERSON*
         PN, BD

<PAGE>

Item 1.  Security and Issuer.

This statement refers to the Common Stock of Unit Instruments,  Inc., 22600 Savi
Ranch Parkway, Yorba Linda, CA., 92887. Michael J. Doyle is the President.

Item 2.  Identity and Background.

Loeb Arbitrage Fund ("LAF"),  61 Broadway,  New York, New York,  10006, is a New
York limited partnership. It is a registered broker/dealer.  Its general partner
is Loeb Arbitrage Management,  Inc., ("LAM"), a Delaware  corporation,  with the
same  address.  Its  President is Arthur E. Lee,  who is also an Executive  Vice
President of Loeb Partners Corporation.  The other officers of LAM are Thomas L.
Kempner,  Chairman of the Board, Irwin D. Rowe, Vice President and Secretary and
Peter A. Tcherepnine,  Vice President.  Loeb Partners  Corporation  ("LPC"),  61
Broadway,  New  York,  New  York,  10006,  is a  Delaware  corporation.  It is a
registered  broker/dealer and a registered investment adviser. Thomas L. Kempner
is its President and a director and its Chief Executive  Officer.  Irwin D. Rowe
is an Executive Vice President and also a director of LPC.  Norman N. Mintz is a
Vice President and also a director. Loeb Holding Corporation ("LHC"), a Maryland
corporation,  61 Broadway,  New York, New York, 10006 is the sole stockholder of
Loeb Arbitrage Management,  Inc. and LPC. Thomas L. Kempner is its President and
a director  as well as its Chief  Executive  Officer and  majority  stockholder.
Irwin D. Rowe is a director of LHC, as are Robert Krones, Edward E. Matthews and
Norman N. Mintz.  Mr.  Matthews'  address is 70 Pine Street,  New York, New York
10270. The business address of the other  individuals is 61 Broadway,  New York,
New York, 10006. All of the individuals  named are United States Citizens.  None
have  within  the last five  years,  been  convicted  in a  criminal  proceeding
(excluding traffic violations or similar misdemeanors) or have been a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
and as a result of such  proceeding  have  been or are  subject  to a  judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws or finding any
violations with respect to such laws.

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

Shares  of  Common  Stock  were  acquired  by LAF  and  LPC in  margin  accounts
maintained with Bear Stearns Securities Corp.

Item 4.   Purpose of Transaction.

LAF and LPC have acquired  shares of Common Stock for investment  purposes.  LAF
and LPC  reserve  the  right  to sell  shares  of  Common  Stock  or to  acquire
additional shares in open market transactions or otherwise.
<PAGE>

Item 5.  Interest in Securities of the Issuer.

(a) The  persons  reporting  hereby  owned the  following  shares of Stock as of
December 3, 1998.
                                  Shares of Common Stock

Loeb Arbitrage Fund                        190,787
Loeb Partners Corporation*                  24,954
                                           214,841

The total  shares of Common Stock  constitute  5.38% the  3,995,118  outstanding
shares of Common Stock as reported by the issuer.
- -------------------------
* Including  10,438  shares of Common  Stock  purchased  for the accounts of two
customers of Loeb Partners Corporation as to which it has investment discretion.

(b) See paragraph (a) above.

(c) The  following  purchases  of Common  Stock have been made in the last sixty
(60) days by the following:


                                   Purchases of Common Stock
Holder                            Date     Shares      Average Price
Loeb Arbitrage Fund           11-04-98       2640              $6.76
                              11-04-98       4400               6.89
                              11-12-98       3880               8.50
                              11-13-98      26460               8.16
                              11-16-98       4400               8.08
                              11-17-98       7055               8.26
                              11-18-98        875               8.26
                              11-18-98        875               8.26
                              11-19-98       1320               8.26
                              11-20-98        875               8.26
                              11-20-98       3085               8.39
                              11-24-98       5910               8.52
                              11-24-98       2640               8.58
                              11-24-98       5290               8.71
                              11-30-98       1760               8.89
                              12-02-98       7495               8.51
                              12-02-98       1760               8.83
                              12-02-98       7935               8.89
                              12-03-98      10585               8.83

                                  Date     Shares      Average Price

Loeb Partners Corp.*          11-04-98        360              $6.77
                              11-04-98        600               6.89
                              11-12-98        520               8.50
                              11-13-98       3540               8.16
                              11-16-98        600               8.08
                              11-17-98        945               8.27
                              11-18-98        125               8.27
                              11-18-98        125               8.27
                              11-19-98        180               8.27
                              11-20-98        125               8.27
                              11-20-98        415               8.39
                              11-24-98        790               8.52
                              11-24-98        360               8.58
                              11-24-98        710               8.72
                              11-30-98        240               8.89
                              12-02-98       1005               8.52
                              12-02-98        240               8.83
                              12-02-98       1065               8.89
                              12-03-98       1415               8.84
- --------------------
*Including  6,896  shares of Common Stock  purchased  and 3,542 shares of Common
Stock  purchased for the accounts of two customers of Loeb Partners  Corporation
as to which it has investment discretion.

All reported transactions were effected on NASDAQ.

(d) and (e). Not applicable.

Item 6.Contracts, Arrangements, Understandings or Relationships with Respect to
       the Issuer.

                  None.

Item 7.  Materials to be Filed as Exhibits.

                  None.

<PAGE>


Signature

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.

December 8, 1998                        Loeb Arbitrage Fund
                                    By: Loeb Arbitrage Management, Inc.


                                    By: /s/ Arthur E. Lee, President

December 8, 1998                        Loeb Partners Corporation


                                    By: /s/ Arthur E. Lee
                                            Executive Vice President





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