Nos. 91-3437, 91-3673. Submitted May 15, 1992. Decided September 1, 1992. John C. Zwakman, Minneapolis, Minn., argued, for petitioner. William Baudler, Washington, D.C., argued (Paul J. Spielberg, Michael J. Gan, Jerry M. Hunter, D. Randall Frye and Aileen A. Armstrong, on the brief), for respondent. Review of decision of National Labor Relations Board. Before RICHARD S. ARNOLD, Chief Judge, LAY, Senior Circuit Judge, and BOWMAN, Circuit Judge. RICHARD S. ARNOLD, Chief Judge. This case arises from