No. 546, Dockets 91-4117, 91-4145. Argued December 5, 1991. Decided February 19, 1992. S. Richard Pincus, Chicago, III. (Joshua D. Holleb, Fox and Grove, Chartered, Joseph M. Kehoe, Jr., Sears, Roebuck Co., of counsel), for petitioner-cross-respondent. Fred L. Cornnell, Washington, D.C. (Jerry M. Hunter, Gen. Counsel, D. Randall Frye, Acting Deputy Gen. Counsel, Aileen A. Armstrong, Deputy Associate Gen. Counsel, Charles Donnelly, Supervisory Atty., N.L.R.B., of counsel), for respondent-cross-petitioner