No. 92-2384. Heard September 9, 1993. Decided November 12, 1993. Marcos A. Ramirez Lavandero, Hato Rey, PR, with whom Pedro J. Salicrup, Rio Piedras, PR, was on brief, for petitioner. Martin M. Eskenazi, Atty., with whom Jerry M. Hunter, Gen. Counsel, Yvonne T. Dixon, Acting Deputy Gen. Counsel, Nicholas E. Karatinos, Acting Associate Gen. Counsel, Margery E. Lieber, Asst. Gen. Counsel for Sp. Litigation, and Eric G. Moskowitz, Deputy Asst. Gen. Counsel for Sp. Litigation, N.L.R.B., Washington, DC