Nos. 638, 869, Dockets 72-1892, 72-2029. Argued May 3, 1973. Decided July 5, 1973. Martin F. Payson, New York City (G. Harrison Darby, Philip S. Mortenson, Jackson, Lewis, Schnitzler Krupman, New York City, on the brief), for petitioner. William R. Stewart, Washington, D.C. (John D. Burgoyne, Peter G. Nash, Gen. Counsel, John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., Washington, D.C., on the brief), for respondent