No. 79-7545. Argued and Submitted September 9, 1980. Decided March 23, 1981. Susan L. Williams, Washington, D.C., for petitioner. Eugene R. Nielson, Lane, Powell, Moss Miller, Seattle, Wash., for respondent. On Petition for Review and Cross-application for Enforcement of an Order of the National Labor Relations Board. Before SNEED and FLETCHER, Circuit Judges, and JAMESON, District Judge. The Hon. William J. Jameson, Senior United States District Judge for the District of Montana, sitting by designation