No. 418, Docket 33994. Argued February 3, 1970. Decided March 11, 1970. Stanley J. Brown, N.L.R.B., Washington, D.C. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and John D. Burgoyne, N.L.R.B., Washington, D.C., on the brief), for petitioner. Joseph S. Rosenthal, New York City (Friedlander, Gaines, Ruttenberg Goetz, New York City, on the brief), for respondents. Before WATERMAN and ANDERSON, Circuit Judges, and TYLER, District