No. 91-3269. Submitted Under Third Circuit Rule 12(6), December 12, 1991. Decided December 17, 1991. Jerry M. Hunter, D. Randall Frye, Aileen A. Armstrong, Charles Donnelly and David Seid, N.L.R.B., Washington, D.C., for petitioner. Howard R. Flaxman, Blank, Rome, Comisky McCauley, Philadelphia, Pa., for respondent. Richard J. Brean, United Steelworkers of America, Pittsburgh, Pa., for amicus-petitioner, United Steelworkers of America, AFL-CIO-CLC. Petition from the National Labor Relations Board