Evetta Dennis, Thomas Dennis, Patricia Williams, Darlenesmith, Ruth Ann Cast, Estella Vick v. Communication Machinery Corporation, A/k/a Cmc And/or Cmcrockwell, As Successor to And/or D/b/a Communicationmachinery Research Corporation, Cmc Acquisition Corp.,unisys Corporation, Pertec Computer Corporation, Scanoptics, Inc., Sperry Rand Corporation; Unisys Corporation,pertec Computer Corporation v. Pertec Computer Corporation, Pertec, 135 F.3d 764 (3d Cir. 1997)