No. 16621. Argued October 3, 1967. Decided March 4, 1968. Warren M. Davison, N.L.R.B., Washington, D.C. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Linda Sher, Attorney, N.L.R.B., on the brief), for petitioner. John G. Wayman, Reed, Smith, Shaw McClay, Pittsburgh, Pa. (W.D. Armour, Pittsburgh, Pa., Ithamar D. Weed, Cincinatti, Ohio, on the brief), for respondent. Before STALEY, Chief Judge, and MARIS and VAN DUSEN, Circuit Judges