No. 14537. December 16, 1961. Elliott Moore, N.L.R.B., Washington, D.C., Stuart Rothman, Dominick L. Manoli, Marcel Mallet-Prevost and Samuel M. Singer, N.L.R.B., Washington, D.C., on brief, for petitioner. Frank C. Heath, Cleveland, Ohio, Jones, Day, Cockley Reavis, Cleveland, Ohio, on brief, for Industrial Rayon Corp. Louis S. Belkin, Cleveland, Ohio, Belkin, Barnett, Kent Shapiro, Cleveland, Ohio, on brief, for International Union of Operating Engineers, Local 600, AFL-CIO. Before SIMONS, MARTIN