No. 77-1943. Submitted May 19, 1978. Decided May 24, 1978. Benjamin J. Francka, Springfield, Mo., on brief, 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 Christine W. Peterson, Atty., N.L.R.B., Washington, D.C., on brief, for petitioner. Petition from National Labor Relations Board. Before HEANEY and STEPHENSON, Circuit Judges, and BECKER, Senior District Judge. The