No. 78-1900. Argued February 22, 1979. Decided March 2, 1979. Andrew M. Kramer, Washington, D.C. (Deborah Crandall, Seyfarth, Shaw, Fairweather Geraldson, Washington, D.C., on brief), for petitioner. Standau E. Weinbrecht, N.L.R.B., (John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, John D. Burgoyne, Assistant Gen. Counsel, James Y. Callear, N.L.R.B., Washington, D.C., on brief), for