Document:

Exhibit 4.7

          THE ISSUANCE OF THIS WARRANT AND ANY SHARES OF COMMON STOCK
ISSUABLE UPON THE EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED. ACCORDINGLY, NO TRANSFER OF THIS
WARRANT OR ANY SHARES OF COMMON STOCK ISSUABLE OR ISSUED UPON THE EXERCISE
HEREOF MAY BE MADE EXCEPT IN COMPLIANCE WITH SUCH STATUTE AND THE TERMS OF
THE WARRANT AGREEMENT REFERRED TO BELOW, A COPY OF WHICH IS ON FILE AT THE
OFFICE OF GCA CORPORATION.

Void After 4:00 P.M., Boston Time, on April 23, 2002

                                     GCA CORPORATION WARRANT
Number ____________                         Warrant to Purchase _______
                                            Shares of Common Stock

          This is to certify that _____________________________ , or
registered assigns (the "Holder"), is entitled to purchase from GCA
Corporation, a Delaware corporation (the "Company"), at an exercise price
(the "Warrant Price") of ________________,(1) at any time prior to 4:00
p.m. (Boston time) on April 23, 2002, _________ fully paid and
non-assessable shares (after giving effect to the 1-for-50 reverse stock
split (the "Reverse Split") of the Common Stock (as hereinafter defined)
contemplated to occur on April 24, 1987) of the Company's common stock, par
value $.01 per share (the "Common Stock"), subject to adjustment as
hereinafter provided.

------------------------
(1). SUCH AMOUNT SHALL BE 150% OF THE BOOK VALUE PER SHARE OF THE COMPANY'S
COMMON STOCK AS OF THE LAST DAY OF THE FISCAL MONTH IN WHICH THE CLOSING,
AS DEFINED IN THAT CERTAIN RESTRUCTURING AGREEMENT, DATED AS OF DECEMBER 5,
1986, AMONG THE COMPANY, THE HALLWOOD GROUP INCORPORATED, AND THE LENDERS
NAMED THEREIN, OCCURS.

          1. This Warrant is one of a series of Warrants (the "Warrants"),
for the purchase of an aggregate of 2,190,806 shares of Common Stock,
subject to adjustment, issued by the Company pursuant to that certain
Warrant Agreement, dated as of April 23, 1987, among the Company, The
Hallwood Group Incorporated, a Delaware corporation, and the Lender Group
referred to therein, a copy of which is on file at the office of the
Company referred to below, and is subject to the terms of such Warrant
Agreement, to all of which terms every Holder consents by acceptance
hereof.

          2. The rights represented by this Warrant may be exercised by the
Holder hereof at any time or from time to time prior to 4:00 p.m. (Boston
time) on April 23, 2002, as to the whole or any part of the shares of
Common Stock covered hereby, by the surrender of this Warrant, together
with (i) the Subscription Form attached hereto appropriately completed, and
(ii) payment (in cash, by certified check or by wire transfer, in each case
of immediately available funds) of the Warrant Price for the share or
shares of Common Stock so purchased, to the Company at its office at 7
Shattuck Road, Andover, Massachusetts 01810 (or at such other office as the
Company may designate by written notice to the holder hereof). Thereupon,
this Warrant shall be deemed to have been exercised and the person
exercising the same shall be deemed to have become a holder of record of
the shares of Common Stock purchased hereunder for all purposes, and
certificates for such shares of Common Stock so purchased shall be
delivered to the purchaser within a reasonable time after this Warrant
shall have been exercised as set forth hereinabove. If this Warrant shall
be exercised in respect of only a part of the shares of Common Stock
subject hereto, the Company shall deliver to the Holder a Warrant
registered in the name of the Holder (or his designee) with respect to that
number of shares of Common Stock in respect of which this Warrant shall not
have been exercised.

          3. No certificate for a fraction of a share of Common Stock will
be issued. As to any fractions of a share of Common Stock that would
otherwise be purchasable on exercise of a Warrant, the Company shall make
payment in lieu thereof in an amount of cash equal to the current value of
such fraction computed on the basis of the last reported sale price on the
day upon which the exercise of the Warrant shall have taken place or, in
case no such reported sale takes place on such day, the average of the last
reported bid and asked prices on such day, in either case on the principal
national securities exchange (which, for purposes hereof, shall be deemed
to include the NASDAQ National Market System) on which the Common Stock is
listed or admitted to trading, or if not listed or admitted to trading on
any national securities exchange, the average mean of the bid and asked
prices in the over-the-counter market as reported by the National
Association of Securities Dealers Automated Quotation System, or if such
organization is not in existence, by an organization providing similar
services.

          4. Subject to the terms and conditions of the Warrant Agreement,
this Warrant and any interest therein or in the shares of Common Stock
issuable upon exercise thereof is transferable on the books of the Company
at its office at 7 Shattuck Road, Andover, Massachusetts 01810 (or such
other office as the Company may designate by written notice to the holder
hereof), by the Holder hereof in person or by duly authorized attorney,
upon surrender of this Warrant together with the Assignment Form attached
hereto, duly executed, whereupon this Warrant (and any interest therein or
in the shares of Common Stock issuable upon exercise hereof) shall be
deemed to have been transferred and the transferee to have become the
holder of record thereof. Promptly following such surrender, the Company
shall issue a new Warrant (or certificate of shares) registered in the name
of the transferee.

          5. The rights of the Holder of this Warrant shall be subject to
the following further terms and conditions:

          (a) The Warrant Price and the number of shares of Common Stock
purchasable pursuant to this Warrant shall be subject to adjustment from
time to time as follows. In case the Company shall (i) declare a dividend
or make a distribution on shares of its Common Stock payable in shares of
Common Stock, or (ii) subdivide or reclassify its outstanding shares of
Common Stock into a greater number of shares of Common Stock (a "stock
split"), the Warrant Price shall be adjusted by multiplying it by a
fraction, (A) the numerator of which shall be the number of shares of
Common Stock outstanding immediately prior to such stock dividend or stock
split, and (B) the denominator of which shall be the number of shares of
Common Stock outstanding immediately following such stock dividend or stock
split and the number of shares of Common Stock purchasable upon the
exercise of this Warrant immediately prior thereto shall be multiplied by
the inverse of such fraction. Conversely, in case of any combination,
reclassification or consolidation (other than the Reverse Split) of the
number of outstanding shares of Common Stock into a lesser number of
shares, the Warrant Price shall be adjusted by multiplying it by a
fraction, (x) the numerator of which shall be the number of shares of
Common Stock outstanding immediately prior to such combination,
reclassification or consolidation, and (y) the denominator of which shall
be the number of shares of Common Stock outstanding immediately following
such combination, reclassification or consolidation and the number of
shares of Common Stock purchaseable upon the exercise of this Warrant
immediately prior thereto shall be multiplied by the inverse of such
fraction. Such adjustments shall be made successively whenever any event
listed above shall occur.

          (b) In case of any reclassification or change in the outstanding
shares of Common Stock (other than a change in par value, or from par value
to no par value, or from no par value to par value, or as a result of a
subdivision or combination, but including any change of the shares of
Common Stock into two or more classes or series of common stock), or in
case of any consolidation of the Company with, or merger of the Company
with or into, another Person (other than a consolidation or merger in which
the Company is the continuing entity and which does not result in any
reclassification or change in the outstanding shares of Common Stock), or
in case of any conveyance or transfer to another Person of the property of
the Company as an entirety or substantially as an entirety, the Company, or
such successor purchasing Person, shall provide that the Holder of this
Warrant shall have the right to obtain, upon the same terms and conditions,
the kind and amount of shares and other securities, cash and property that
would have been receivable by such Holder upon such reclassification,
change, consolidation, merger, conveyance or transfer if the rights
represented by such Warrant had been exercised to purchase Common Stock
immediately prior thereto. Such other Person, which shall thereafter be
deemed to be the Company for purposes of this Warrant, shall provide for
adjustments which shall be as nearly equivalent as may be practicable to
the adjustments provided for hereinabove.

          (c) In case at any time the Company shall propose

               (i) to declare any dividend or make any distribution on
shares of Common Stock payable in shares of Common Stock or fix a record
date for the making of any other distribution (other than a cash dividend)
to all holders of shares of Common Stock; or

               (ii) to fix a record date for the issuance of rights or
warrants to all holders of its Common Stock entitling them to purchase any
additional shares or beneficial interest of any class or any other rights
or warrants; or

               (iii) to consolidate or merge with or into any Person or
convey or transfer its properties and assets substantially as an entirety
to any Person; or

               (iv) to effect any reorganization, reclassification,
liquidation, dissolution, or winding-up of the Company; then, in any one or
more of such cases, the Company shall give 30 days prior written notice to
the Holder of this Warrant of the date on which (A) the books of the
Company shall close or a record shall be taken for such dividend on shares
of Common Stock, distribution or offering of rights or warrants, or (B)
such consolidation, merger, conveyance, transfer, reorganization,
reclassification, liquidation, dissolution or winding-up shall take place,
as the case may be.

          (d) As used in this paragraph 5,

               (i) "Common Stock" shall mean the Common Stock of the
Company as constituted on the date hereof, and shares of any class or
classes resulting from any reclassification thereof that have no preference
in respect of dividends or amounts payable in the event of any voluntary or
involuntary liquidation, dissolution or winding-up of the Company and which
are not subject to redemption by the Company;

               (ii) "Person" shall mean any individual, corporation,
partnership, joint venture, association, joint-stock company, trust,
unincorporated organization or government or any agency or political
subdivision thereof.

          (e) Except as otherwise provided herein, the Holder hereof shall
not be entitled on account of holding this Warrant to any rights of a
stockholder of the Company either at law or in equity, or to any notice of
meetings of stockholders or of any other proceedings of the Company.

          (f) The Holder of this Warrant shall, upon demand, disclose to
the Company in writing such information as is readily available to the
Holder with respect to direct, indirect, actual and/or constructive
ownership of shares of Common Stock and/or Warrants as the Company may deem
necessary to comply with the provisions of the Internal Revenue Code of
1986 (the "Code") or with the requirements of any other taxing authority.
For the purpose of this subparagraph (f), "ownership" of shares of Common
Stock shall be determined as provided in Section 544 of the Code or any
successor provisions as then in effect and the number of shares of Common
Stock owned shall include all shares of Common Stock that may then be
acquired upon conversion, exchange or exercise of rights under other
securities.

          (g) Each Holder of this Warrant shall furnish the Company with
the address to which all notices provided for herein to be given to such
holder shall be sent. The Company shall be entitled for all purposes to
consider the Person in whose name this Warrant is issued as the lawful
owner of this Warrant and as entitled to exercise all his rights hereunder,
and no other Person shall have any rights with respect thereto.

Dated:  Apri1 23, 1987                  GCA CORPORATION

                                        By
                                          ----------------------------

<PAGE>

                       ASSIGNMENT FORM TO BE EXECUTED
                          UPON TRANSFER OR WARRANT

          FOR VALUE RECEIVED, ______________________________________ here-
by sell(s), assign(s) and transfer(s) unto __________________________
______________ the right to purchase ______________ shares of Common Stock
covered by the within Warrant, and do hereby irrevocably constitute and
appoint said Attorney, to transfer said right on the books of GCA
Corporation, with full power of substitution in the premises.

Dated:                               [                                  ]
      -----------------------         ----------------------------------
                                     By:
                                        --------------------------------
                                     Title:
                                           -----------------------------

<PAGE>

                      SUBSCRIPTION FORM TO BE EXECUTED
                          UPON EXERCISE OR WARRANT

          The undersigned hereby exercises, according to the terms and
conditions thereof, the right to purchase ________ shares of Common Stock
evidenced by the within Warrant, and herewith makes payment of the purchase
price in full.

Dated:                               [                                  ]
      -----------------------         ----------------------------------
                                     By:
                                        --------------------------------
                                     Title:
                                           -----------------------------Exhibit 4.8

     THE ISSUANCE OF THIS  WARRANT AND ANY SHARES OF COMMON STOCK  ISSUABLE
UPON THE EXERCISE HEREOF HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT
OF 1933, AS AMENDED. ACCORDINGLY, NO TRANSFER OF THIS WARRANT OR ANY SHARES
OF COMMON  STOCK  ISSUABLE OR ISSUED UPON THE  EXERCISE  HEREOF MAY BE MADE
EXCEPT  IN  COMPLIANCE  WITH  SUCH  STATUTE  AND THE  TERMS OF THE  WARRANT
AGREEMENT  REFERRED  TO BELOW,  A COPY OF WHICH IS ON FILE AT THE OFFICE OF
GCA CORPORATION.

Void After 4:00 P.M., Boston Time, on September 1, 2002

                          GCA Corporation Warrant

Number -14-                                Warrant to Purchase 500,000
                                           Shares of Common Stock

     This is to certify that Carl Zeiss,  Inc., or registered  assigns (the
"Holder"),  is  entitled  to  purchase  from GCA  Corporation,  a  Delaware
corporation (the "Company"),  at an exercise price (the "Warrant Price") of
$12.32 per share, at any time prior to 4:00 p.m. (Boston time) on September
1, 2002,  500,000  fully paid and  non-assessable  shares of the  Company's
common  stock,  par value $.01 per share (the "Common  Stock"),  subject to
adjustment as hereinafter provided.

     1. The rights  represented  by this  Warrant may be  exercised  by the
Holder  hereof at any time or from time to time prior to 4:00 p.m.  (Boston
time) on  September  1, 2002,  as to the whole or any part of the shares of
Common Stock covered  hereby,  by the  surrender of this Warrant,  together
with (i) the Subscription Form attached hereto appropriately completed, and
(ii) payment (in cash, by certified check or by wire transfer, in each case
of  immediately  available  funds)  of the  Warrant  Price for the share or
shares of Common  Stock so  purchased,  to the  Company  at its office at 7
Shattuck Road, Andover, Massachusetts 01810 (or at such other office as the
Company may designate by written notice to the holder  hereof).  Thereupon,
this  Warrant  shall  be  deemed  to have  been  exercised  and the  person
exercising  the same  shall be deemed to have  become a holder of record of
the  shares of Common  Stock  purchased  hereunder  for all  purposes,  and
certificates  for  such  shares  of  Common  Stock  so  purchased  shall be
delivered  to the  purchaser  within a  reasonable  time after this Warrant
shall have been exercised as set forth  hereinabove.  If this Warrant shall
be  exercised  in  respect  of only a part of the  shares of  Common  Stock
subject  hereto,  the  Company  shall  deliver  to  the  Holder  a  Warrant
registered in the name of the Holder (or his designee) with respect to that
number of shares of Common Stock in respect of which this Warrant shall not
have been exercised.

     2. No  certificate  for a fraction of a share of Common  Stock will be
issued. As to any fractions of a share of Common Stock that would otherwise
be purchasable on exercise of a Warrant,  the Company shall make payment in
lieu  thereof  in an  amount  of cash  equal to the  current  value of such
fraction  computed on the basis of the last  reported sale price on the day
upon which the  exercise of the Warrant  shall have taken place or, in case
no such  reported  sale takes  place on such day,  the  average of the last
reported bid and asked prices on such day, in either case on the  principal
national securities  exchange (which, for purposes hereof,  shall be deemed
to include the NASDAQ  National Market System) on which the Common Stock is
listed or admitted  to trading,  or if not listed or admitted to trading on
any  national  securities  exchange,  the average mean of the bid and asked
prices  in  the  over-the-counter   market  as  reported  by  the  National
Association of Securities  Dealers  Automated  Quotation System, or if such
organization  is not in existence,  by an  organization  providing  similar
services.

     3. Subject to the terms and conditions of the Warrant Agreement,  this
Warrant and any interest  therein or in the shares of Common Stock issuable
upon exercise  thereof is  transferable  on the books of the Company at its
offices at 7 Shattuck  Road,  Andover,  Massachusetts  01810 (or such other
office as the  Company  may  designate  by  written  notice  to the  holder
hereof),  by the Holder  hereof in person or by duly  authorized  attorney,
upon surrender of this Warrant  together with the Assignment  Form attached
hereto, duly executed,  whereupon this Warrant (and any interest therein or
in the shares of Common  Stock  issuable  upon  exercise  hereof)  shall be
deemed to have been  transferred  and the  transferee  to have  become  the
holder of record thereof.  Promptly  following such surrender,  the Company
shall issue a new Warrant (or certificate of shares) registered in the name
of the transferee.

     4. The  rights of the Holder of this  Warrant  shall be subject to the
following further terms and conditions:

          (a) The  Warrant  Price and the number of shares of Common  Stock
purchasable pursuant to this Warrant shall be subject to adjustment from to
time as follows. In case the Company shall (i) declare a dividend or make a
distribution  on shares of its  Common  Stock  payable  in shares of Common
Stock,  or (ii)  subdivide or reclassify its  outstanding  shares of Common
Stock into a greater  number of shares of Common  Stock (a "stock  split"),
the Warrant Price shall be adjusted by  multiplying  it by a fraction,  (A)
the  numerator  of which  shall be the  number of  shares  of Common  Stock
outstanding  immediately  prior to such stock dividend or stock split,  and
(B) and the  denominator  of which  shall be the number of shares of Common
Stock outstanding  immediately following such stock dividend or stock split
and the number of shares of Common Stock  purchasable  upon the exercise of
this Warrant  immediately  prior thereto shall be multiplied by the inverse
of such fraction. Conversely, in case of any combination,  reclassification
or consolidation of the number of outstanding shares of Common Stock into a
lesser number of shares, the Warrant Price shall be adjusted by multiplying
it by a fraction,  (x) the numerator of which shall be the number of shares
of  Common  Stock  outstanding   immediately  prior  to  such  combination,
reclassification  or consolidation,  and (y) the denominator of which shall
be the number of shares of Common Stock outstanding  immediately  following
such  combination,  reclassification  or  consolidation  and the  number of
shares  of Common  Stock  purchasable  upon the  exercise  of this  Warrant
immediately  prior  thereto  shall be  multiplied  by the  inverse  of such
fraction.  Such adjustments shall be made  successively  whenever any event
listed above shall occur.

          (b) in case of any  reclassification or change in the outstanding
shares of Common Stock (other than a change in par value, or from par value
to no par  value,  or from no par value to par  value,  or as a result of a
subdivision  or  combination,  but  including  any  change of the shares of
Common  Stock into two or more  classes or series of common  stock),  or in
case of any  consolidation  of the Company  with,  or merger of the Company
with or into, another Person (other than a consolidation or merger in which
the  Company  is the  continuing  entity  and which  does not result in any
reclassification  or change in the outstanding  shares of Common Stock), or
in case of any  conveyance or transfer to another Person of the property of
the Company as an entirety or substantially as an entirety, the Company, or
such  successor  purchasing  Person,  shall provide that the Holder of this
Warrant shall have the right to obtain, upon the same terms and conditions,
the kind and amount of shares and other securities,  cash and property that
would  have been  receivable  by such  Holder  upon such  reclassification,
change,  consolidation,  merger,  conveyance  or  transfer  if  the  rights
represented  by such Warrant had been  exercised  to purchase  Common Stock
immediately  prior thereto.  Such other Person,  which shall  thereafter be
deemed to be the Company for purposes of this  Warrant,  shall  provide for
adjustments  which shall be as nearly  equivalent as may be  practicable to
the adjustments provided for hereinabove.

          (c) In case at any time the Company shall propose

               (i) to declare  any  dividend  or make any  distribution  on
shares of Common  Stock  payable in shares of Common  Stock or fix a record
date for the making of any other distribution  (other than a cash dividend)
to all holders of shares of Common Stock; or

               (ii) to fix a record  date for the  issuance  of  rights  or
warrants to all holders of its Common Stock  entitling them to purchase any
additional  shares or beneficial  interest of any class or any other rights
or warrants; or

               (iii) to  consolidate  or merge  with or into any  Person or
convey or transfer its properties and assets  substantially  as an entirety
to any Person; or

               (iv)  to  effect   any   reorganization,   reclassification,
liquidation, dissolution, or winding-up of the Company;

then,  in any one or more of such  cases,  the  Company  shall give 30 days
prior written notice to the Holder of this Warrant of the date on which (A)
the books of the Company  shall  close or a record  shall be taken for such
dividend on shares of Common Stock,  distribution  or offering of rights or
warrants,  or  (B)  such  consolidation,   merger,  conveyance,   transfer,
reorganization,  reclassification,  liquidation,  dissolution or winding-up
shall take place, as the case may be.

          (d) As used in this paragraph 4,

               (i)  "Common  Stock"  shall  mean  the  Common  Stock of the
Company  as  constituted  on the date  hereof,  and  shares of any class or
classes resulting from any reclassification thereof that have no preference
in respect of dividends or amounts payable in the event of any voluntary or
involuntary liquidation, dissolution or winding-up of the Company and which
are not subject to redemption by the Company;

               (ii)  "Persons"  shall  mean  any  individual,  corporation,
partnership,  joint  venture,  association,   joint-stock  company,  trust,
unincorporated  organization  or  government  or any  agency  or  political
subdivision thereof.

          (e) Except as otherwise  provided herein, the Holder hereof shall
not be  entitled  on  account of  holding  this  Warrant to any rights of a
stockholder of the Company either at law or in equity,  or to any notice of
meetings of stockholders or of any other proceedings of the Company.

          (f) The Holder of this Warrant  shall,  upon demand,  disclose to
the Company in writing  such  information  as is readily  available  to the
Holder  with  respect  to  direct,  indirect,  actual  and/or  constructive
ownership of shares of Common Stock and/or Warrants as the Company may deem
necessary to comply with the  provisions  of the  Internal  Revenue Code of
1986 (the "Code") or with the  requirements of any other taxing  authority.
For the purpose of this subparagraph  (f),  "ownership" of shares of Common
Stock  shall be  determined  as  provided in Section 544 of the Code or any
successor  provisions  as then in effect and the number of shares of Common
Stock  owned  shall  include  all  shares of Common  Stock that may then be
acquired  upon  conversion,  exchange  or  exercise  of rights  under other
securities.

          (g) Each Holder of this  Warrant  shall  furnish the Company with
the  address to which all notices  provided  for herein to be given to such
holder  shall be sent.  The Company  shall be entitled  for all purposes to
consider  the  Person in whose  name this  Warrant  is issued as the lawful
owner of this Warrant and is entitled to exercise all his rights hereunder,
and no other Person shall have any rights with respect thereto.

Dated:  September 1, 1987           GCA CORPORATION

                                    By
                                      -------------------------------
                                             (Name and Title)

<PAGE>

                       ASSIGNMENT FORM TO BE EXECUTED
                          UPON TRANSFER OR WARRANT

          FOR VALUE  RECEIVED,  ___________________________________  hereby
sell(s), assign(s) and transfer(s) unto _________________ _________________
the right to purchase  _______ shares of Common Stock covered by the within
Warrant, and do hereby irrevocably constitute and appoint said Attorney, to
transfer  said  right on the books of GCA  Corporation,  with full power of
substitution in the premises.

Dated:                               [                                  ]
      -----------------------         ----------------------------------
                                     By:
                                        --------------------------------
                                     Title:
                                           -----------------------------

<PAGE>

                      SUBSCRIPTION FORM TO BE EXECUTED
                          UPON EXERCISE OR WARRANT

          The  undersigned  hereby  exercises,  according  to the terms and
conditions  thereof,  the right to  purchase  ___________  shares of Common
Stock  evidenced by the within  Warrant;  and herewith makes payment of the
purchase price in full.

Dated:                               [                                  ]
      -----------------------         ----------------------------------
                                     By:
                                        --------------------------------
                                     Title:
                                           -----------------------------

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