No. 79-1479. Argued June 8, 1979. Decided July 18, 1979. Thomas A. Bergstrom (argued), Philadelphia, Pa., for appellant FMC Corporation. Peter F. Vaira, U.S. Atty., Walter S. Batty, Jr. (argued), Asst. U.S. Atty., Chief, Appellate Division, William B. Lytton (argued), Asst. U.S. Atty., Jane Barrett McEvoy, Sp. Asst. U.S. Atty., Philadelphia, Pa., for appellee. Appeal from the United States District Court for the Eastern District of Pennsylvania. Before HUNTER, WEIS and GARTH, Circuit Judges. OPINION