No. 73-1127. Argued September 10, 1973. Decided November 16, 1973. James L. Price, Steinberg, Greenstein, Richman Price, Philadelphia, Pa., for petitioner. Peter G. Nash, Gen. Counsel, John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Elliott Moore, Acting Asst. Gen. Counsel, N.L.R.B., Robert A. Giannasi, Jonathan G. Axelrod, Washington, D.C., for respondent. Richard H. Markowitz, Stephen C. Richman, Markowitz Kirschner, Philadelphia, Pa., for intervenor. Petition for review