No. 82-1079. Argued February 10, 1983. Decided March 28, 1983. Lawrence Odell, Patrick Duffy O'Neill, and Colorado, Martinez, Odell, Calabria Sierra, Hato Rey, P.R., on brief, for petitioner. Lawrence E. Blatnik, Washington, D.C., with whom William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, W. Christian Schumann and Helen L. Morgan, Attys., N.L.R.B., Washington, D.C., were on brief, for