Nos. 94-5132 and 94-5164. Argued December 1, 1994. Decided April 25, 1995. As Corrected May 4, 1995. James M. Lee (Argued), Crummy, Del Deo, Dolan, Griffinger Vecchione, Newark, NJ, for appellee Industry Network System. Kevin P. Roddy, Milberg, Weiss, Bershad, Hynes Lerach, Los Angeles, CA, for appellee Industry Network System. Edith K. Payne, Stryker, Tams Dill, Newark, NJ, for appellee Armstrong World Industries. Martin London, Cameron Clark, Jeh C. Johnson, Paul, Weiss, Rifkind, Wharton Garrison