No. 83-3548. Argued September 12, 1984. Decided January 31, 1985. William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, Howard E. Perlstein, Abby Propis Simms (Argued), N.L.R.B., Washington, D.C., for petitioner. Daniel C. Cohen (Argued), Jeffrey L. Braff, Wolf, Block, Schorr Solis-Cohen, Philadelphia, Pa., for respondent. Before ADAMS, HIGGINBOTHAM, and SLOVITER, Circuit Judges. OPINION