No. 78-1146. Submitted September 15, 1978. Decided January 23, 1979. Rehearing and Rehearing En Banc Denied February 13, 1979. Peter Winkler, Atty., N.L.R.B., Washington, D.C. (argued), John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Carl L. Taylor, Associate Gen. Counsel, and Elliott Moore, Deputy Associate Gen. Counsel, Marjorie S. Gofreed, Atty., Washington, D.C., on brief, for petitioner. Donald W. Jones, Prewitt, Jones Karchmer, Springfield, Mo., argued and on brief