HEALTHDYNE TECHNOLOGIES INC
SC 13D, 1997-06-26
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                          Healthdyne Technologies, Inc.
                                (Name of Issuer)

                          Common Stock, $.01 par value
                         (Title of Class of Securities)

                                    422206102
                                 (CUSIP Number)


                             Abbe L. Dienstag, Esq.
                        Kramer, Levin, Naftalis & Frankel
                                919 Third Avenue
                            New York, New York 10022
                                 (212) 715-9100
                     (Name, Address and Telephone Number of
                      Person Authorized to Receive Notices
                               and Communications)

                                  June 16, 1997
                      (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: |_|



                               Page 1 of 19 pages

                        Exhibit Index appears on page 14


<PAGE>


                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 2 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  DICKSTEIN & CO., L.P.                               13-3321472

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a) |_|

                                                           (b) SEE ITEM 5

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

- --------------------------------------------------------------------------------
4)      SOURCE OF FUNDS

                  WC

- --------------------------------------------------------------------------------
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
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        730,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          730,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 730,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

- --------------------------------------------------------------------------------
13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        5.7% (See Item 5)

- --------------------------------------------------------------------------------
14)     TYPE OF REPORTING PERSON
                  PN


                                      - 2 -


<PAGE>

                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 3 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  DICKSTEIN FOCUS FUND L.P.                           13-3746015

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) |_|

                                                                  (b) SEE ITEM 5

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

- --------------------------------------------------------------------------------
4)      SOURCE OF FUNDS

                  WC

- --------------------------------------------------------------------------------
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
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        146,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          146,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 146,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

- --------------------------------------------------------------------------------
13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        1.1% (See Item 5)

- --------------------------------------------------------------------------------
14)     TYPE OF REPORTING PERSON
                  PN


                                      - 3 -


<PAGE>

                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 4 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  DICKSTEIN INTERNATIONAL LIMITED

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP       (a) |_|

                                                               (b) SEE ITEM 5

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

- --------------------------------------------------------------------------------
4)      SOURCE OF FUNDS

                  WC

- --------------------------------------------------------------------------------
5)      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) OR 2(e)                                |_|

- --------------------------------------------------------------------------------
6)      CITIZENSHIP OR PLACE OF ORGANIZATION

                  BRITISH VIRGIN ISLANDS

- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        123,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          123,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 123,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

- --------------------------------------------------------------------------------
13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        1.0% (See Item 5)

- --------------------------------------------------------------------------------
14)     TYPE OF REPORTING PERSON
                  CO


                                      - 4 -


<PAGE>

                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 5 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  DICKSTEIN PARTNERS, L.P.                            13-3544838

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a) |_|

                                                                  (b) SEE ITEM 5

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

- --------------------------------------------------------------------------------
4)      SOURCE OF FUNDS

                  AF

- --------------------------------------------------------------------------------
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
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        876,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          876,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 876,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        6.9% (See Item 5)

14)     TYPE OF REPORTING PERSON
                  PN


                                      - 5 -


<PAGE>

                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 6 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  DICKSTEIN PARTNERS INC.                             13-3537972

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP      (a) |_|

                                                              (b) SEE ITEM 5

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

4)      SOURCE OF FUNDS

                  AF

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
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        999,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          999,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 999,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

- --------------------------------------------------------------------------------
13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        7.8% (See Item 5)

- --------------------------------------------------------------------------------
14)     TYPE OF REPORTING PERSON
                  CO


                                      - 6 -


<PAGE>

                                  SCHEDULE 13D

CUSIP No. 422206102                                           Page 7 of 19 Pages
- --------------------------------------------------------------------------------
1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  MARK DICKSTEIN

- --------------------------------------------------------------------------------
2)      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a) |_|

                                                             (b) SEE ITEM 5

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

- --------------------------------------------------------------------------------
4)      SOURCE OF FUNDS

                  AF

- --------------------------------------------------------------------------------
5)      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) OR 2(e)                                |_|

- --------------------------------------------------------------------------------
6)      CITIZENSHIP OR PLACE OF ORGANIZATION

                  UNITED STATES

- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      Not Applicable
        NUMBER
        OF                     8)     SHARED VOTING POWER
        SHARES                        999,000 (See Item 5)
        BENEFICIALLY
        OWNED BY               9)     SOLE DISPOSITIVE POWER
        EACH                          Not Applicable
        REPORTING
        PERSON                 10)    SHARED DISPOSITIVE POWER
        WITH                          999,000 (See Item 5)

- --------------------------------------------------------------------------------
11)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
        PERSON 999,000 (See Item 5)

- --------------------------------------------------------------------------------
12)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                |_|

- --------------------------------------------------------------------------------
13)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        7.8% (See Item 5)

- --------------------------------------------------------------------------------
14)     TYPE OF REPORTING PERSON
                  IN


                                      - 7 -


<PAGE>


                                  Schedule 13D


ITEM 1. SECURITY AND ISSUER.

         This Statement on Schedule 13D (the "Statement")  relates to the Common
Stock, $.01 par value (the "Common Stock"), of Healthdyne Technologies,  Inc., a
Georgia  corporation,  (the "Company").  The principal  executive offices of the
Company are located at 1255 Kennestone Circle, Marietta, Georgia 30066.

ITEM 2. IDENTITY AND BACKGROUND.

         (a) - (c) This  Statement  is  being  filed by  Dickstein  & Co.,  L.P.
("Dickstein & Co."),  Dickstein Focus Fund L.P. ("Dickstein  Focus"),  Dickstein
International  Limited ("Dickstein  International"),  Dickstein  Partners,  L.P.
("Dickstein  Partners"),  Dickstein  Partners Inc.  ("Dickstein  Inc.") and Mark
Dickstein. Dickstein & Co., Dickstein Focus, Dickstein International,  Dickstein
Partners,  Dickstein Inc. and Mark Dickstein are collectively referred to as the
"Reporting Persons."

         Dickstein & Co. is a Delaware  limited  partnership  engaged in certain
investment  activities,  including,  but not  limited  to, (i) the  purchase  of
marketable and  non-marketable  securities and other  obligations of bankrupt or
near  bankrupt  companies,   (ii)  risk-arbitrage   transactions  undertaken  in
connection  with,  among other things,  mergers and  acquisitions  and (iii) the
purchase of securities in entities which appear to be undervalued.

         Dickstein  Focus is a Delaware  limited  partnership  which  engages in
certain investment  activities similar in nature to the activities engaged in by
Dickstein & Co.

         Dickstein  International is a  limited-liability,  open-end  investment
fund  incorporated as an international  business company in the Territory of the
British Virgin Islands.  Dickstein  International  engages in certain investment
activities similar in nature to the activities engaged in by Dickstein & Co.

         Dickstein  Partners is a Delaware  limited  partnership and the general
partner of  Dickstein & Co. and  Dickstein  Focus and makes all  investment  and
trading decisions for Dickstein & Co. and Dickstein Focus.

         Dickstein Inc. is a Delaware  corporation and is the general partner of
Dickstein Partners and the advisor to Dickstein  International.  In its capacity
as advisor,  Dickstein  Inc.  makes all  investment  and trading  decisions  for
Dickstein  International.  Mark  Dickstein is the president and sole director of
Dickstein Inc.


                                      - 8 -


<PAGE>

         The business address and the address of the principal  executive office
of each of Dickstein & Co.,  Dickstein Focus,  Dickstein  Partners and Dickstein
Inc. is 660 Madison Avenue,  New York, New York 10021.  The business address and
the address of the principal executive office of Dickstein  International is 129
Front Street, Hamilton HM 12, Bermuda. The business address of Mark Dickstein is
c/o Dickstein Partners, 660 Madison Avenue, New York, New York 10021.

         The  name,  business  address  and  present  principal   occupation  or
employment  of each of the executive  officers and directors of Dickstein  Inc.,
including Mark Dickstein,  are set forth on Schedule I annexed hereto,  which is
incorporated herein by reference.

         (d) - (e) During the last five years,  none of the  Reporting  Persons,
and, to the best knowledge of the Reporting Persons,  none of the persons listed
on Schedule I hereto,  has been  convicted in a criminal  proceeding  (excluding
traffic  violations  and  similar  misdemeanors)  or has been a party to a civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such  proceeding  was or is 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  violation  with
respect to such laws.

         (f) Each natural  person  identified in this Item 2 is a citizen of the
United States.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         The shares of Common  Stock  reported  to be owned by  Dickstein & Co.,
Dickstein  Focus and Dickstein  International  were acquired in the open market.
Giving effect to certain sales of the Common Stock made by each such entity, the
total  cost of the  reported  shares by  Dickstein  & Co.,  Dickstein  Focus and
Dickstein   International   was   $10,990,030,    $2,320,813   and   $1,848,360,
respectively.  Such costs were funded out of working capital,  which may, at any
given time,  include margin loans made by brokerage firms in the ordinary course
of business.

ITEM 4.           PURPOSE OF TRANSACTION.

         The Reporting  Persons acquired  beneficial  ownership of the shares of
Common Stock to which this statement relates for investment.

         The Reporting Persons may acquire  additional shares of Common Stock or
other  securities  of the Company or sell or otherwise  dispose of any or all of
the shares of Common Stock or other securities of the Company beneficially owned
by them. The Reporting Persons may take any other action with respect to the


                                      - 9 -


<PAGE>

Company or any of its debt or equity securities in any manner permitted by law.

         Except as  disclosed  in this  Item 4, the  Reporting  Persons  have no
current plans or proposals  which relate to or would result in any of the events
described  in Items (a)  through (j) of the  instructions  to Item 4 of Schedule
13D.

ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.

         (a) The  Reporting  Persons  beneficially  own an  aggregate of 999,000
shares of Common  Stock,  representing  approximately  7.8% of the Common  Stock
outstanding.   Dickstein  &  Co.  owns  730,000  of  such  shares,  representing
approximately 5.7% of the Common Stock outstanding, Dickstein Focus owns 146,000
of such shares,  representing approximately 1.1% of the Common Stock outstanding
and  Dickstein   International   beneficially   owns  123,000  of  such  shares,
representing approximately 1.0% of the Common Stock outstanding.(1)

         (b) By reason of its position as general partner of Dickstein & Co. and
Dickstein Focus,  Dickstein  Partners may be deemed to possess the power to vote
and dispose of the shares of Common Stock  beneficially  owned by Dickstein & Co
and Dickstein  Focus.  By reason of its position as general partner of Dickstein
Partners and advisor to Dickstein International, Dickstein Inc. may be deemed to
possess the power to vote and dispose of the shares of Common Stock beneficially
owned by Dickstein & Co., Dickstein Focus and Dickstein International. By reason
of his position as president and sole director of Dickstein Inc., Mark Dickstein
may be deemed to possess  the power to vote and  dispose of the shares of Common
Stock  beneficially  owned by  Dickstein & Co.,  Dickstein  Focus and  Dickstein
International.  Pursuant to Rule 13d-4 promulgated under the Securities Exchange
Act of 1934, as amended,  (i) Dickstein & Co. disclaims  beneficial ownership of
all shares of Common Stock  beneficially  owned by Dickstein  International  and
Dickstein  Focus,  (ii) Dickstein  Focus disclaims  beneficial  ownership of all
shares of Common  Stock  beneficially  owned by  Dickstein  & Co. and  Dickstein
International,  (iii) Dickstein  International disclaims beneficial ownership of
all shares of Common Stock  beneficially  owned by Dickstein & Co. and Dickstein
Focus  (iv)  each of  Dickstein  Partners,  Dickstein  Inc.  and Mark  Dickstein
disclaims  beneficial ownership of the shares of Common Stock beneficially owned
by Dickstein & Co., Dickstein Focus and Dickstein  International,  except to the
extent of their actual economic interests.

(1)      Percentages are based upon  12,741,408  shares of Common Stock reported
         outstanding as of May 1, 1997 in the Company's Quarterly Report on Form
         10-Q for the quarter ended March 31, 1997.


                                     - 10 -


<PAGE>

         (c)  Except  for the  transactions  set forth on  Schedule  II  annexed
hereto,  none of the persons  identified in Item 2 has effected any transactions
in the Common Stock during the past 60 days. All such transactions were effected
in the open market.

         (d) Not applicable.

         (e) Not applicable.

ITEM 6.           CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR
                  RELATIONSHIPS WITH RESPECT TO SECURITIES OF
                  THE ISSUER.

                  Not applicable.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS.

Exhibit 1         Agreement  of  joint  filing   pursuant  to  Rule   13d(1)-f  
                  promulgated  under the  Securities  Exchange Act of 1934, as  
                  amended.                                                      


                                     - 11 -


<PAGE>


                                    SIGNATURE


               After reasonable  inquiry and to the best knowledge and belief of
the  undersigned,  the  undersigned  certifies that the information set forth in
this Statement is true, complete and correct.

Date:  June 26, 1997

                                      DICKSTEIN & CO., L.P.

                                      By:      Alan Cooper, as Vice President
                                               of Dickstein Partners Inc.,
                                               the general partner of
                                               Dickstein Partners, L.P., the
                                               general partner of Dickstein &
                                               Co., L.P.

                                      /s/ Alan Cooper
                                      ---------------
                                      Name:  Alan Cooper

                                      DICKSTEIN FOCUS FUND L.P.

                                      By:      Alan Cooper, as Vice President
                                               of Dickstein Partners Inc.,
                                               the general partner of
                                               Partners, L.P., the general
                                               partner of Dickstein Focus
                                               Fund L.P.

                                      /s/ Alan Cooper
                                      ---------------
                                      Name:  Alan Cooper

                                      DICKSTEIN INTERNATIONAL LIMITED

                                      By:      Alan Cooper, as Vice President
                                               of Dickstein Partners Inc.,
                                               the agent of Dickstein
                                               International Limited

                                      /s/ Alan Cooper
                                      ---------------
                                      Name:  Alan Cooper

                                      DICKSTEIN PARTNERS, L.P.

                                      By:      Alan Cooper, as Vice President
                                               of Dickstein Partners Inc.,
                                               the general partner of
                                               Dickstein Partners, L.P.

                                      /s/ Alan Cooper
                                      ---------------
                                      Name:  Alan Cooper


                                     - 12 -


<PAGE>

                                       DICKSTEIN PARTNERS INC.

                                       By:      Alan Cooper, as Vice President

                                       /s/ Alan Cooper
                                       ---------------
                                       Name:  Alan Cooper

                                       /s/ Mark Dickstein
                                       ------------------
                                       Mark Dickstein


                                     - 13 -


<PAGE>

                                  EXHIBIT INDEX


EXHIBIT          DESCRIPTION                                              PAGE

1                Agreement  of joint  filing  pursuant                    18
                 to Rule  13d(1)-f  promulgated  under 
                 the Securities Exchange Act of 1934,  
                 as amended                            
                 


                                     - 14 -


<PAGE>


                                   SCHEDULE 1

                        EXECUTIVE OFFICERS AND DIRECTORS


               The name and present  principal  occupation or employment of each
of the executive  officers and directors of Dickstein  Inc. are set forth below.
The principal  business address of each of the sole director and the officers of
Dickstein Inc. named below is c/o Dickstein Partners,  Inc., 660 Madison Avenue,
New York, New York 10021.

                                 Dickstein Partners Inc.

Name and                       Present Principal        
Positions Held                 Occupation or Employment 
                                                        

Mark Dickstein                 President and Sole Director of Dickstein Inc. 
President and                  
Sole Director


Alan S. Cooper                 Vice President and General Counsel of 
Vice President                 Dickstein Inc.
and General
Counsel

Steven Cornick                 Vice President of Dickstein Inc.
Vice President                 

Edward Farr                    Vice President of Dickstein Inc.
Vice President                 

Mark Kaufman                   Vice President of Dickstein Inc.
Vice President                 

Arthur Wrubel                  Vice President of Dickstein Inc.
Vice President


                                     - 15 -


<PAGE>

                                   SCHEDULE II

                             TRANSACTIONS IN COMMON
                                    STOCK OF
                          HEALTHDYNE TECHNOLOGIES, INC.
                          DURING THE PRECEDING 60 DAYS

Shares Purchased by Dickstein & Co., L.P.
- -----------------------------------------

<TABLE>
<CAPTION>
                         Number of
                          Shares              Price per                                                 Total
Date                     Purchased              share                Commission                         Cost

<S>                       <C>                 <C>                      <C>                            <C>
5/12/97                     2,800             14.500                   15.00                          40,615.00
5/14/97                    25,000             14.750                   15.00                         368,765.00
5/15/97                     6,600             14.625                   15.00                          96,540.00
5/19/97                     5,400             14.750                   15.00                          79,665.00
5/20/97                     4,800             14.625                   15.00                          70,215.00
5/21/97                     8,000             14.750                   15.00                         118,015.00
5/22/97                    10,000             14.750                   15.00                         147,515.00
6/4/97                    130,000             15.488                   15.00                       2,013,455.00
6/5/97                     20,000             15.500                   15.00                         310,015.00
6/11/97                    20,000             15.201                   15.00                         304,035.00
6/13/97                    16,000             15.507                   15.00                         248,127.00
6/16/97                   138,000             15.746                   15.00                       2,172,963.00
6/17/97                     7,600             15.750                   15.00                         119,715.00
6/18/97                    52,000             15.705                   15.00                         816,675.00
6/20/97                    13,000             15.688                   15.00                         203,953.50
6/23/97                    55,800             17.032                   15.00                         950,400.60
6/24/97                    15,000             17.063                   15.00                         255,952.50


Shares Purchased by Dickstein International Limited

                         Number of
                          Shares              Price per                                                 Total
Date                     Purchased              share                Commission                         Cost

<S>                       <C>                 <C>                      <C>                            <C>
5/14/97                     4,100             14.750                   15.00                          60,490.00
5/19/97                     1,000             14.750                   15.00                          14,765.00
5/20/97                       800             14.625                   15.00                          11,715.00
5/21/97                     2,000             14.750                   15.00                          29,515.00
5/22/97                     3,600             14.750                   15.00                          53,115.00
6/4/97                     20,000             15.488                   15.00                         309,775.00
6/5/97                      2,300             15.500                   15.00                          35,665.00
6/11/97                     3,500             15.201                   15.00                          53,218.50
6/13/97                     4,500             15.507                   15.00                          69,796.50
6/16/97                    23,000             15.746                   15.00                         362,173.00
6/17/97                     1,400             15.750                   15.00                          22,065.00
6/18/97                     8,900             15.705                   15.00                         139,789.50
6/20/97                     2,500             15.688                   15.00                          39,233.75
6/23/97                     9,400             17.032                   15.00                         160,115.80
6/24/97                     2,000             17.063                   15.00                          34,140.00

</TABLE>


                                     - 16 -


<PAGE>


Shares Purchased by Dickstein Focus Fund L.P.

<TABLE>
<CAPTION>
                         Number of
                          Shares              Price per                                                 Total
Date                     Purchased              share                Commission                         Cost

<S>                       <C>                 <C>                      <C>                            <C>
6/13/97                    66,000             15.507                   15.00                       1,023,477.00
6/16/97                    28,700             15.746                   15.00                         451,925.20
6/17/97                     1,500             15.750                   15.00                          23,640.00
6/18/97                    10,400             15.705                   15.00                         163,347.00
6/20/97                     9,500             15.688                   15.00                         149,046.25
6/23/97                    26,900             17.032                   15.00                         458,175.80
6/24/97                     3,000             17.063                   15.00                          51,202.50

</TABLE>


                                     - 17 -

<PAGE>

                       Exhibit 1 Agreement of Joint Filing


                                    EXHIBIT 1

                            AGREEMENT OF JOINT FILING


         Pursuant to Rule 13d-1(f) promulgated under the Securities Exchange Act
of 1934,  the  undersigned  persons hereby agree to file with the Securities and
Exchange  Commission  the Statement on Schedule 13D (the  "Statement")  to which
this Agreement is attached as an exhibit,  and agree that such Statement,  as so
filed, is filed on behalf of each of them.

         IN WITNESS WHEREOF,  the undersigned have executed this Agreement as of
June 26, 1997.

                                 DICKSTEIN & CO., L.P.

                                 By:      Alan Cooper, as Vice President
                                          of Dickstein Partners Inc.,
                                          the general partner of
                                          Dickstein Partners, L.P., the
                                          general partner of Dickstein &
                                          Co., L.P.

                                 /s/ Alan Cooper
                                 ---------------
                                 Name:  Alan Cooper

                                 DICKSTEIN FOCUS FUND L.P.

                                 By:      Alan Cooper, as Vice President
                                          of Dickstein Partners Inc.,
                                          the general partner of
                                          Dickstein Partners, L.P., the
                                          general partner of Dickstein
                                          Focus Fund L.P.

                                 /s/ Alan Cooper
                                 ---------------
                                 Name:  Alan Cooper


                                 DICKSTEIN INTERNATIONAL LIMITED

                                 By:      Alan Cooper, as Vice President
                                          of Dickstein Partners Inc.,
                                          the agent of Dickstein
                                          International Limited

                                 /s/ Alan Cooper
                                 ---------------
                                 Name:  Alan Cooper


                                     - 18 -

<PAGE>

                                 DICKSTEIN PARTNERS, L.P.

                                 By:      Alan Cooper, as Vice President
                                          of Dickstein Partners Inc.,
                                          the general partner of
                                          Dickstein Partners, L.P.

                                 /s/ Alan Cooper
                                 ---------------
                                 Name:  Alan Cooper

                                 DICKSTEIN PARTNERS INC.

                                 By:  Alan Cooper, as Vice President

                                 /s/ Alan Cooper
                                 ---------------
                                 Name:  Alan Cooper

                                 /s/ Mark Dickstein
                                 ------------------
                                 Mark Dickstein


                                     - 19 -


<PAGE>


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