No. 11856. Argued June 21, 1956. Decided September 25, 1956. John G. Wayman, Pittsburgh, Pa. (Leonard L. Scheinholtz, Reed, Smith, Shaw McClay, Pittsburgh, Pa., on the brief), for petitioner. Edward Friedman, Atty., N.L.R.B., Washington, D.C. (Theophil C. Kammholz, Gen. Counsel, David P. Findling, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Frederick U. Reel, Atty., N.L.R.B., Washington, D.C., on the brief), for respondent. Before BIGGS, Chief Judge, GOODRICH, Circuit Judge