No. 72-1320. Argued October 16, 1972. Decided June 29, 1973. Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., Washington, D.C., Jerome H. Brooks, Director Region 7, N.L.R.B., Detroit, Mich., Robert A. Giannasi, N.L.R.B., for petitioner-appellant; Peter G. Nash, Gen. Counsel, Stephen J. Solomon, Allen H. Feldman, Attys., N.L.R.B., on brief. Craig A. Miller, Kalamazoo, Mich., for respondents-appellees; Gemrich, Moser, Dombrowski, Bowser Garvey by Craig A. Miller, Kalamazoo, Mich., on brief for