No. 88-3040. Argued July 18, 1988. Decided September 27, 1988. Barbara A. Atkin, Supervising Atty., Laurence S. Zakson, Atty. (argued), N.L.R.B., Washington, D.C., Rosemary M. Collyer, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Aileen A. Armstrong, Deputy Associate Gen. Counsel, for petitioner. Stephen J. Cabot (argued), Myerson Kuhn, Philadelphia, Pa., for respondent. Before HIGGINBOTHAM, BECKER and ROSENN, Circuit Judges. OPINION OF THE COURT