WARBURG PINCUS ASSET MANAGEMENT INC
SC 13G, 1999-01-13
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<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                           (Amendment No. __________)*

                         Allied Healthcare Products Inc
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    0192229A
                                 (CUSIP Number)

                                December 31, 1998
             (Date of Event Which Requires Filing of this Statement)

        Check the appropriate box to designate the rule pursuant to which
                            this Schedule is filed:

                                [X] Rule 13d-1(b)
                                [ ] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)

*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 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 1 of 4 Pages
<PAGE>






- ------------------------                             -------------------------
CUSIP No.     0192229A               13G                Page  2 of   4  Pages
           -------------                                     --     ----
- ------------------------                             -------------------------

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

    Warburg Pincus Asset Management, Inc.                    13-2673503
- ---------- -------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

                                                            (a) [  ]

    Not applicable                                          (b) [  ]
- ------------------------------------------------------------------------------
 3  SEC USE ONLY

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

    Delaware
- -----------------------------------------------------------------------------
                  5   SOLE VOTING POWER

                        0
                  --- -------------------------------------------------------
     NUMBER OF    6   SHARED VOTING POWER
      SHARES
   BENEFICIALLY         601,500
     OWNED BY
                  --- -------------------------------------------------------
       EACH       7   SOLE DISPOSITIVE POWER
     REPORTING
      PERSON            601,500
       WITH
                  --- -------------------------------------------------------
                  8   SHARED DISPOSITIVE POWER

                        0
- -----------------------------------------------------------------------------
 9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    601,500
- -----------------------------------------------------------------------------
 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
    SHARES (SEE INSTRUCTIONS)

    Not applicable
- -----------------------------------------------------------------------------
 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

    7.70%
- -----------------------------------------------------------------------------
 12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
    IA

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


<PAGE>


Item 1(a):     Name of Issuer:
- ---------      --------------

               Allied Healthcare Products Inc.

Item 1(b):     Address of Issuer's Principal Executive Offices:
- ---------      -----------------------------------------------

               1720 Sublette Avenue
               St. Louis, MO  63110-1968


Item 2(a)      Name of Person Filing
- --------       ---------------------

               Warburg Pincus Asset Management, Inc.

Item 2(b):     Address of Principal Business Office:
- --------       ------------------------------------

               466 Lexington Avenue, New York, New York 10017

Item 2(c):     Citizenship:
- --------       -----------

               Delaware

Item 2(d):     Title of Class of Securities:
- --------       ----------------------------

               Common Stock

Item 2(e):     CUSIP Number:
- --------       ------------

               0192229A

Item 3:        If the reporting person is an investment adviser in accordance
- --------       with ss. 240.13d-1(b)(1)(ii)(E), check this box.  [X]

Item 4:        Ownership:
- --------       ---------

               (a) Amount beneficially owned:   601,500

               (b) Percent of class:   7.70%.

               (c) Number of shares as to which the  person has:

                     (i) Sole power to vote or to direct the vote 0.

                    (ii) Shared power to vote or to direct the vote 601,500.

                   (iii) Sole power to dispose or to direct the disposition
                          of 601,500.

                    (iv) Shared power to dispose or to direct the disposition
                         of 0.

Item 5:        Ownership of Five Percent or Less of a Class:
- --------       --------------------------------------------
               Not Applicable.


                               Page 3 of 4 Pages
<PAGE>


Item 6:   Ownership of More than Five Percent on Behalf of Another Person:
- ------    ---------------------------------------------------------------

          Warburg  Pincus  Asset  Management,  Inc.  ("WPAM")  is an  Investment
          Adviser  registered  with the United  States  Securities  and Exchange
          Commission.  WPAM  serves  as  investment  adviser  to  many  accounts
          including  various  registered  investment  companies.  The securities
          which are the  subject of this  report are owned by our  accounts.  In
          this report one or more corporate accounts owned more than 5%.


Item 7:   Identification and Classification of the
- --------  ----------------------------------------
          Subsidiary Which Acquired the Security Being
          --------------------------------------------
          Reported on By the Parent Holding Company:
          -----------------------------------------

          Not Applicable.

Item 8:   Identification and Classification of
- ------    ------------------------------------
          Members of the Group:
          --------------------

          Not Applicable.

Item 9:   Notice of Dissolution of Group:
- ------    ------------------------------

          Not Applicable.

Item 10:  Certification:
- -------   -------------     

          By  signing  below I certify  that,  to the best of my  knowledge  and
          belief, the securities referred to above were acquired and are held in
          the ordinary course of business and were not acquired and are not held
          for the purpose of or with the effect of changing or  influencing  the
          control of the issuer of the  securities and were not acquired and are
          not held in  connection  with or as a participant  in any  transaction
          having that purpose or effect.



                                    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.

Dated: January 8, 1999


                                            By: /s/ Linda S. Iovan
                                                ------------------------
                                                Name:  Linda S. Iovan
                                                Title: Vice President

                                Page 4 of 4 Pages



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