No. 71-1853. December 8, 1972. Robert M. Lieber (argued), of Littler, Mendelson Fastiff, San Francisco, Cal., for petitioner. Joseph E. Mayer, Atty. (argued), Marcel Mallet-Prevost, Asst. Gen. Counsel, Peter G. Nash, Gen. Counsel, Washington, D.C., Roy O. Hoffman, Director, Region 21, NLRB, San Francisco, Cal., for respondent. Bernard Dunau (argued), Plato E. Papps, Washington, D.C., for intervenor. Petition for review from the National Labor Relations Board. Before CHAMBERS and BROWNING, Circuit