No. 154, Docket 24277. Argued January 16, 1957. Decided March 15, 1957. Jerome D. Fenton, General Counsel Theophil C. Kammholz, General Counsel, Stephen Leonard, Associate General Counsel, Washington, D.C. (Winthrop A. Johns, Asst. General Counsel, of counsel), William W. Kapell, Philadelphia, Pa., and Walter N. Moldawer, Attorneys, National Labor Relations Board, Washington, D.C., for petitioner-appellant. John T. Sullivan, New York City, for respondents-appellees. Before MEDINA and HINCKS, Circuit