Nos. 93-1304, 93-1425. Argued September 14, 1994. Decided May 19, 1995. Paul Grossman argued the cause for petitioner Gibson Greetings, Inc. With him on the briefs were Zachary D. Fasman, Lawrence Peikes, Frank H. Stewart, and Brian P. Gillan. Paul L. Styles, Jr., argued the cause and filed the briefs for petitioner Intern. Broth. of Firemen Oilers. William M. Bernstein, Atty., N.L.R.B., argued the cause for respondent. With him on the brief were Frederick L. Feinstein, Gen. Counsel, Linda R. Sher