No. 72-1498. December 4, 1972. Rehearing Denied January 19, 1973. John M. Flynn (argued), Baruch A. Fellner, Marcel Mallet-Prevost, Asst. Gen. Counsel, Peter G. Nash, Gen. Counsel, Washington, D.C., Roy O. Hoffman, Director, Region 20, NLRB, San Francisco, Cal., for petitioner. Victor J. Van Bourg (argued), Michael B. Roger, of Levy Van Bourg, San Francisco, Cal., for respondent. Wesley J. Fastiff (argued), of Littler, Mendelson Fastiff, San Francisco, Cal., for intervenor. Before DUNIWAY and TRASK