Cal. No. 502, Docket 72-1932. Argued March 5, 1973. Decided June 14, 1973. Paul J. Spielberg, N.L.R.B., Washington, D.C. (Peter G. Nash, Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Joseph A. Oertel, Atty., N.L.R.B., Washington, D.C., on the brief), for petitioner. Edward Schneider, Boston, Mass. (Philip Schneider and Brown, Rudnick, Freed Gesmer, Boston, Mass., on the brief), for respondent. Petition from the NLRB. Before LUMBARD and TIMBERS