No. 77-1707. Argued January 10, 1978. Decided February 22, 1978. Rehearing and Rehearing En Banc Denied March 23, 1978. William J. Rooney, Dearborn, Mich., William W. McKittrick, Chicago, Ill., for petitioner. Elliott Moore, Deputy Associate Gen. Counsel, Linda E. Auerbach, William R. Stewart, Attys., N.L.R.B., Washington, D.C., for respondent. Petition for review from the National Labor Relations Board. Before SWYGERT and SPRECHER, Circuit Judges, and GRANT, Senior District Judge. Senior District