No. 71-1397. August 1, 1972. Rehearing Denied November 14, 1972. Charles Steele, Atty. (argued), William Wachter, Joseph E. Mayer, Attys., Dominic L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Atty. Gen., Peter G. Nash, Gen. Counsel, Washington, D.C., Roy O. Hoffman, Director, NLRB, Region 20, San Francisco, Cal., for petitioner. Robert J. Scolnik (argued), San Francisco, Cal., Marvin S. Siegel (argued), Menlo Park, Cal., Norman Leonard, San Francisco, Cal., Robert B. Snow, Jr.