No. 79-1373. Submitted December 3, 1979. Decided December 28, 1979. Rehearing Denied February 6, 1980. Allison W. Brown, Jr., and Catherine Garcia, Attys., John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, and Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., Washington, D.C., for petitioner. Richard B. Slosberg, Pittsburgh, Pa., for respondent. Appeal from the National Labor Relations Board. Before HEANEY, BRIGHT and ROSS