Exhibit 3.7


                          CERTIFICATE OF INCORPORATION
                                       OF
                        DREXEL HERITAGE ADVERTISING, INC.

      1. The name of the corporation is:

               Drexel Heritage Advertising, Inc.

      2. The address of its registered office in the state of Delaware is 1209
Orange Street in the City of Wilmington, County of New Castle. The name of its
registered agent at such address is The Corporation Trust Company.

      3. The nature of the business or purpose to be conducted or promoted is to
engage in any lawful act or activity for which corporations may be organized
under the General Corporation Law of Delaware.

      4. The total number of shares of stock which the corporation shall have
authority to issue is One Thousand (1,000) and the par value of each of the
shares is One Dollar ($1.00) amounting in the aggregate to One Thousand Dollars
($1,000).

      5. The board of directors is authorized to make, alter, or repeal the
By-laws of the corporation. Election of directors need not be by ballot.

      6. The name and mailing address of the incorporator is:

          Sharon O' Brien
          21001 Van Born Road
          Taylor, Michigan 48180

      I, the undersigned, being the incorporator of the above named corporation,
for the purpose of forming a corporation pursuant to the General Corporation Law
of Delaware, do make this certificate hereby declaring and certifying that this
is my act and deed and the facts herein stated are true and accordingly
hereunder set my hand on this 12th day of February, 1990.

                                                /s/  Sharon O' Brien
                                                -----------------------
                                                Sharon O'Brien