Nos. 86-6209, 87-5143. Argued November 3, 1987. Decided October 20, 1988. Bruce A. Hoffman (argued), Cincinnati, Ohio, for petitioner, cross-respondent. Elliott Moore, Deputy Associate General Counsel, N.L.R.B., Washington, D.C., Judith Dowd, (argued), Charles Donnelly, Peter Winkler, for respondent, cross-petitioner. D.M. Silberman, Washington, D.C., for intervenor. Petition for review from the National Labor Relations Board. Before ENGEL, Chief Judge, KENNEDY, Circuit Judge, and EDWARDS, Senior