Nos. 77-1691, 77-1726. Submitted October 18, 1978. Decided December 21, 1978. William H. Bruckner, Tate, Bruckner Sykes, Houston, Tex., and Kenneth R. Carr, Grambling, Mounce, Sims, Galatzan Harris, El Paso, Tex., for petitioner. David F. Zorensky, Atty., N.L.R.B., Washington, D.C., for respondent; John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Carl L. Taylor, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and Howard E. Perlstein, Atty., N.L.R.B.,