No. 14015. Argued December 6, 1962. Decided April 4, 1963. Melvin J. Welles, NLRB, Washington, D.C. (Stuart Rothman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Seymour Strongin, Attorneys, National Labor Relations Board, on the brief), for petitioner. Richard H. Markowitz, Philadelphia, Pa. (Wilderman, Markowitz Kirschner, Philadelphia, Pa., on the brief), for respondent. Marcus Manoff, Dilworth, Paxson Kalish, Kohn Dilks, Philadelphia, Pa