No. 71-1529, 72-1794. Argued March 8, 1973. Decided September 13, 1973. Laurence Gold, Washington, D.C., for petitioners. Sidney Dickstein, Washington, D.C., and Thomas F. Phalen, Jr., Dayton, Ohio, were on the brief for petitioner in No. 71-1529. Patricia Eames, New York City, J. Albert Woll and Thomas E. Harris, Washington, D.C., were on the brief for petitioner in No. 72-1794. Stanley R. Zirkin, Atty., National Labor Relations Board with whom Marcel Mallet-Prevost, Asst. Gen. Counsel, Washington