No. 11863. Argued November 12, 1956. Decided December 11, 1956. Rehearing Denied January 10, 1957. Elizabeth Weston, Washington, D.C. (Theophil C. Kammholz, Gen. Counsel, David P. Findling, Asso. Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Alice Andrews, National Labor Relations Board, Washington, D.C., on the brief), for petitioner. Richard H. Markowitz, Philadelphia, Pa. (Wilderman Markowitz, Louis H. Wilderman, Philadelphia, Pa., on the brief), for respondents. Before GOODRICH, McLAUGHLIN