Nos. 87-5381, 87-5462. Argued July 18, 1988. Decided January 18, 1989. Jack R. Clary, Clary, Nantz, Wood, Hoffius, Rankin and Cooper, Robert C. Stone, Lead Counsel (argued), Douglas W. Van Essen, Grand Rapids, Mich., for petitioner, cross-respondent. Harvey I. Wax, M. Catherine Farrell, Levin, Levin, Garvett Dill, Southfield, Mich., for intervenor. Aileen A. Armstrong, Deputy Associate General Counsel, N.L.R.B., Judith Dowd (argued), Washington, D.C., Barbara A. Atkin, Bernard Gottfried, Director