No. 82-3201. Argued January 6, 1983. Decided January 19, 1983. Rehearing and Rehearing In Banc Denied March 11, 1983. James B. Hecht (argued), Richard V. Sica, Thorp, Reed Armstrong, Pittsburgh, Pa., for petitioner. Vivian A. Miller, Mendelssohn V. McLean (argued), William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Elliott Moore, Deputy-Associate Gen. Counsel, N.L.R.B., Washington, D.C., for respondent. Petition for review from the