No. 309, Docket 26688. Argued April 12, 1961. Decided May 10, 1961. Glen M. Bendixsen, Stuart Rothman, General Counsel, Dominick L. Manoli, Associate General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, Allison W. Brown, Jr., Attorney, National Labor Relations Board, Washington, D.C., for the Board. Sol E. King, New York City, for the Cadillac Corporation. Harry Weinstock, Henry Brickman, New York City, Weinstock Tauber, New York City, of counsel, for the Union. Before FRIENDLY, HAND and