No. 83-3106. Argued November 16, 1983. Decided January 23, 1984. William M. Bernstein (Argued), William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., Washington, D.C., for petitioner. John V. Adams, Jr. (Argued), Adams, Shoemaker McSorley, Pittsburgh, Pa., for respondent. Before ADAMS and BECKER, Circuit Judges, and NEWCOMER, District Judge. Honorable Clarence C. Newcomer, United