No. 78-1518. Submitted March 14, 1979. Decided March 21, 1979. Rehearing and Rehearing En Banc Denied April 10, 1979. Earl B. Wilburn of Wiley, Craig, Armbruster, Wilburn Mills, St. Louis, Mo., argued and on brief, for petitioner. Catherine Garcia, Atty., N.L.R.B., Washington, D.C. (argued), John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel and Paul J. Spielberg, Deputy Asst. Gen. Counsel