of the very case in which the privilege is sought); Hanover Shoe, Inc. v. United Shoe Mach. Corp., 207 F.Supp. 407, 410 (M.D. Pa.1962) (same); cf. Hercules Inc. v. Exxon Corp., 434 F.Supp. 136, 153 (D.De1.1977) (privilege extends to only those subsequent cases which are closely related); Midland Inv. Co. v.