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                                                                     EXHIBIT 3.7

                          CERTIFICATE OF INCORPORATION


       BE IT KNOWN, That We, The subscribers, certify that we do hereby
associate ourselves as a body politic and corporate under the statute laws at
the State of Connecticut; and we further certify:

       FIRST:  That the name of the Corporation is BISHOP MANUFACTURING
COMPANY, INCORPORATED.

       SECOND:  That the said corporation is to be located in the City of
Bridgeport, Connecticut County of Fairfield and State of Connecticut.

       THIRD:  That the nature of the business to be transacted and the
purposes to be promoted or carried out by said Corporation, are as follows:

              a.)    To manufacture, buy, sell, export, import, act as
                     manufacturers and others' agent, and generally to deal in
                     doors, windows, and sash of all sizes, types and
                     descriptions, and parts and supplies of all kinds and
                     descriptions incidental to the manufacture, construction,
                     repair and maintenance of doors, windows, and sash of all
                     sizes, types and descriptions.

              b.)    To manufacture, sell or otherwise dispose of aluminum
                     combination storm doors, screens, windows and jealousies
                     to acquire by purchase, lease, option, or contract, or
                     otherwise, and to hold, maintain, manage, work, develop,
                     let, sublet, sell, exchange, mortgage, encumber, bond or
                     dispose of both real and personal property of every kind
                     and nature whatsoever.

              c.)    To manufacture, buy, sell and generally deal in metal
                     horizontal and vertical sliding doors and windows and
                     parts and supplies of all kinds and descriptions
                     incidental to the manufactures, construction, repair, and
                     maintenance of metal horizontal and vertical sliding doors
                     and windows.

              d.)    To design, construct, and fabricate metal windows, frames,
                     sashes, jaulosies and carry on all other business
                     incident.

              e.)    To sell, buy, construct, lease and otherwise acquire,
                     operate, dispose of, maintain and conduct offices, plants,
                     warehouse facilities for the conduct of this business.

              f.)    To borrow or raise money, to lend, advance, extend credit
                     in any manner and to make gifts contributions, and
                     donations within reason to further goodwill toward the
                     corporation.

              g.)    To acquire, and make payment, therefore, in cash or stocks
                     or bonds of the Corp., or by undertaking or assuming the
                     obligations and liabilities of the 

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                     transferor, or in any other way, the good will, rights and
                     property, the whole or any part of the assets, tangible or
                     intangible, and to undertake or assume the liabilities of,
                     any person, firm, association, or corporation and to hold
                     or in any manner dispose of the whole or any of the
                     property so purchased, to conduct in any lawful manner the
                     whole or any part of the business so acquired and to
                     exercise all the powers    necessary and convenient for
                     the conduct and management  thereof.
        
              h.)    And to engage in all other activities related to the
                     success of this business venture.

       FOURTH:  That the amount of the Capital stock of said corporation hereby
authorized is 150 shares without par value and in one class, common; the voting
power vested exclusively in the common share holder.

       FIFTH:  That the amount of capital stock with which this corporation
shall commence business is $3,000.00 (Three Thousand Dollars).

       SIXTH:  That the Duration of said corporation is unlimited.

                                   SIGNATURES


       /s/ Abe Meizel     OF   87 Barnyard Lane, Long Island   STATE OF New York
       /s/ David Siegler  OF   8 Fairfield Bard, Kings Point   STATE OF New York
       /s/ Sydney Isler   OF   1723 E. 16th St., Brooklyn      STATE OF New York

       Dated at Bridgeport, this 9th day of October, A.D. 1958.
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STATE OF CONNECTICUT )
COUNTY OF FAIRFIELD  )ss. Bridgeport October 9 1958

       Personally appeared

       ABE MEIZEL           /s/ Abe Meizel
       DAVID SIEGLER        /s/ David Siegler
       SYDNEY ISLER         /s/ Sydney Isler

       BEING all of the incorporators of BISHOP MANUFACTURING CO., INC. and
made solemn oath to the truth of the foregoing certificate by them respectively
subscribed before me.



                                                    /s/                       
                                                  ----------------------------
                                                  COMMISSIONER OF THE SUPERIOR
                                                  COURT FOR FAIRFIELD COUNTY