No. 11877. Argued June 7, 1956. Decided June 18, 1956. Fred U. Reel, Washington, D.C. (Theophil C. Kammholz, General Counsel, David P. Findling, Associate General Counsel, Marcel-Mallet Prevost, Asst. General Counsel, National Labor Relations Board, Washington, D.C., on the brief), for petitioner. Sherman T. Rock, Pittsburgh, Pa. (Paul, Lawrence Rock, Pittsburgh, Pa., on the brief), for respondents. Before GOODRICH, KALODNER and HASTIE, Circuit Judges. PER CURIAM. This is a petition for enforcement