No. 21049. June 30, 1971. Stanley R. Zirkin, Atty., N.L.R.B., Washington, D.C., for petitioner; Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Elliott Moore, Stanley R. Zirkin, Attys., N.L.R.B., Washington, D.C., on brief. Douglas C. Dahn, Detroit, Mich., for respondents; Tolleson, Burgess Mead, Robert D. Welchli, Detroit, Mich., on brief. Before CELEBREZZE, PECK and McCREE, Circuit Judges. PER CURIAM. This case is before us a second