No. 81-1854. Argued June 4, 1982. Decided August 13, 1982. Penny Pilzer, Attorney, with whom William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and John D. Burgoyne, Asst. Gen. Counsel, Washington, D.C., were on brief for petitioner. Martin Ames, Chelmsford, Mass., for respondent. Petition from the National Labor Relations Board. Before CAMPBELL and BREYER, Circuit Judges, and PETTINE