Nos. 72-1521, 72-1633. Argued March 8, 1973. Decided November 30, 1973. John M. McLaughlin, William C. Sennett, Knox, Graham, Pearson, McLaughlin Sennett, Erie, Pa., for petitioner in No. 72-1521. Richard H. Zamboldi, Elderkin, Martin Kelly, Erie, Pa., for petitioner in No. 73-1633. Elliot Moore, Deputy Associate Gen. Counsel, Peter G. Nash, Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Joseph E. Mayer, William H. DuRoss, III, Attys., N.L.R.B., Washington