EXHIBIT 10.9

                              AGREEMENT TO EXCHANGE
                    6% CUMULATIVE CONVERTIBLE PREFERRED STOCK
                           AND SPECIAL PREFERRED STOCK

        This AGREEMENT TO EXCHANGE SPECIAL PREFERRED STOCK dated as of March 1,
1996 ("Exchange Agreement"), is made by and among Fairchild Industries,  Inc., a
Delaware corporation  ("Fairchild"),  RHI Holdings, Inc., a Delaware corporation
("RHI"), The Fairchild  Corporation,  a Delaware corporation ("TFC"), and Shared
Technologies Inc., a Delaware  corporation  ("Shared  Technologies").  Terms not
otherwise defined herein which are defined in that certain Agreement and Plan of
Merger  dated as of  November  9, 1995,  as amended  by the First  Amendment  to
Agreement  and  Plan  of  Merger  dated  as of  February  2,  1996  (the  "First
Amendment"), as further amended by the Second Amendment to Agreement and Plan of
Merger  dated as of  February  23,  1996 (the  "Second  Amendment"),  as further
amended  by the Third  Amendment  to  Agreement  and Plan of Merger  dated as of
February 23, 1996 (the "Third Amendment"),  including the exhibits and schedules
thereto (the  Agreement and Plan of Merger,  as amended by the First  Amendment,
the Second  Amendment  and the Third  Amendment,  are  referred to  collectively
herein as the "Merger  Agreement") by and among  Fairchild,  RHI, TFC and Shared
Technologies, shall have the same respective meanings herein as therein.

         WHEREAS,  Section 3.1 of the Merger Agreement provides that RHI will be
issued the 6% Cumulative  Convertible  Preferred Stock and the Special Preferred
Stock of the  Surviving  Corporation  which stock has been  authorized by Shared
Technologies'  Board of  Directors  and  designated  as  Series  G and  Series H
respectively (the "Series G and Series H Stock"); and

         WHEREAS, the terms for such Series G and Series H Stock contain certain
provisions  which would be  inconsistent  with  certain  financing  arrangements
currently being negotiated by the Surviving Corporation; and

         WHEREAS,  RHI has agreed to exchange the Series G and Series H Stock to
be issued to it upon the consummation of the Merger for an equivalent  number of
shares of 6% Cumulative  Convertible Preferred Stock and Special Preferred Stock
which stock has also been authorized by Shared 





Technologies'  Board of  Directors  and  designated  as  Series  I and  Series J
respectively  (the  "Series  I and  Series J  Stock")  containing  such  powers,
designations,  preferences and other rights,  qualifications,  restrictions  and
limitations as described herein (the "Exchange").

         NOW, THEREFORE,  in consideration of the premises and mutual agreements
contained herein and for other good and valuable consideration,  the receipt and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

                                    ARTICLE I

                     POST-MERGER EXCHANGE OF PREFERRED STOCK

         1.1  Immediately  following  the  filing of the  Certificate  of Merger
contemplated by Section 1.2 of the Merger Agreement,  RHI shall surrender to the
Surviving  Corporation  all of the  shares  of the  Series G and  Series H Stock
issued to it in connection with the Merger in exchange for an equivalent  number
of shares of the  Series I and  Series J Stock.  All  shares of the Series G and
Series H Stock and the Special  Preferred  Stock  surrendered  to the  Surviving
Corporation  shall  be  canceled  on the  books  and  records  of the  Surviving
Corporation.

         1.2  The   powers,   designations,   preferences   and  other   rights,
qualifications,  restrictions and limitations of the Series I and Series J Stock
shall be as set forth in the  Designations  thereof appended hereto as Annexes A
and B.

         1.3.   Shared   Technologies   agrees  that  upon  the  Exchange,   the
representations,  warranties and  indemnifications  made by Shared  Technologies
with respect to the Series G and Series H Stock in the Merger Agreement shall be
applicable to the Series I and Series J Stock and Fairchild and TFC hereby agree
that the Series I and Series J Stock  will be  substituted  for the Series G and
Series H Stock pursuant to the Pledge Agreement and all references to the Series
G and Series H Stock in such Pledge Agreement,  the Shareholders'  Agreement and
Indemnification Agreements shall be deemed to refer to the Series I and Series J
Stock.

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                                   ARTICLE II

                        PROVISIONS OF GENERAL APPLICATION

         2.1 Any notice or communication to any party hereto shall be duly given
if sent in the form and manner prescribed in the Merger Agreement.

         2.2  This   Exchange   Agreement   may  be  executed  in  two  or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         2.3 This  Exchange  Agreement  may be varied or amended only by written
action of all of the parties hereto.  This Exchange  Agreement shall be governed
by, and  construed  in  accordance  with laws of the State of  Delaware  without
regard to principles of conflicts of laws.

         IN WITNESS  WHEREOF,  the parties  hereto  have  caused  this  Exchange
Agreement to be executed by their duly  authorized  officers,  all as of the day
and year first above written.

SHARED TECHNOLOGIES INC.                    THE FAIRCHILD CORPORATION

By: /s/ Vincent DiVincenzo                  By: /s/ Michael T. Alcox
    ----------------------                      --------------------

FAIRCHILD INDUSTRIES, INC.                  RHI HOLDINGS, INC.

By: /s/ Michael T. Alcox                    By: /s/ Michael T. Alcox
    --------------------                        --------------------

ACCEPTED AND AGREED TO BY:

FAIRCHILD HOLDING CORP.

By: /s/ Michael T. Alcox
    --------------------

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