No. 883, Docket 86-4144. Argued March 4, 1987. Decided April 29, 1987. Beverly A. Oyama, Attorney, 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, Elliott Moore, Deputy Associate Gen. Counsel, Peter Winkler, Supervisory Attorney, N.L.R.B., Washington, D.C., of counsel), for petitioner. Sheldon Engelhard, Vladeck, Waldman, Elias Engelhard, P.C., New York City (Daniel A. Ladow, Stuart Bauchner, of counsel)