No. 86-5587. Argued December 18, 1986. Decided February 18, 1988. Fred Cornell, argued, Aileen Armstrong, Deputy Associate General Counsel, N.L. R.B., Howard E. Perlstein, Washington, D.C., for petitioner. Craig A. Mutch, argued, Grand Rapids, Mich., and J. Michael Guenther, Ann Arbor, Mich., for respondent. Before MARTIN and GUY, Circuit Judges, and JOHNSTONE, District Judge. Honorable Edward H. Johnstone, United States District Court, Western District of Kentucky, sitting by designation. PER CURIAM