No. 6709. Heard February 7, 1967. Decided February 20, 1967. Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., Washington, D.C., with whom Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, and Warren M. Davison and Frank H. Itkin, Attys., N.L.R.B., Washington, D.C., were on brief, for petitioner. Vicente J. Antonetti, Santurce, P.R., with whom Goldman, Antonetti Subira, Santurce, P.R., were on brief, for respondent. Before ALDRICH, Chief Judge, MARIS and McENTEE, Circuit