Nos. 1429, 1887; Nos. 95-4159(L), 95-4207(XAP). Argued May 20, 1996. Decided September 9, 1996. Steven R. Wall, Morgan, Lewis Bockius, Philadelphia, PA (Edward S. Mazurek, of counsel), for Petitioner-Cross-Respondent. David A. Fleischer, Staff Attorney, National Labor Relations Board, Washington, DC (Frederick L. Feinstein, General Counsel, Linda Sher, Associate General Counsel, Aileen A. Armstrong, Deputy Associate General Counsel, of counsel), for Respondent-Cross-Petitioner. Cross-petitions for