No. 85-7140. Argued and Submitted November 6, 1985. Decided December 30, 1985. Michael B. Roger, Paul Supton, Van Bourg, Weinberg, Roger Rosenfeld, San Francisco, Cal., for petitioners. John Elligers, Washington, D.C., for respondent. Philip L. Ross, Severson, Werson, Berke, Melchior, San Francisco, Cal., for intervenor. On Petition for Review of Decision and Order of the National Labor Relations Board. Before HUG and HALL, Circuit Judges, and JAMESON, District Judge. The Honorable William J. Jameson