No. 79-1177. Submitted September 13, 1979. Decided April 30, 1980. Lawrence P. Kaplan, Suelthaus, Krueger, Cunningham, Yates Kaplan, St. Louis, Mo., for petitioner. Candace M. Carroll, Atty., N.L.R.B., Washington, D.C., argued, for respondent, John D. Burgoyne, Asst. Gen. Counsel, John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel and Elliott Moore, Deputy Associate Gen. Counsel, Washington, D.C., on brief, for respondent. William