No. 300-69. March 31, 1970. Rehearing Denied May 28, 1970. William Wachter, Washington, D.C. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Assoc. Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Ian D. Lanoff, Atty., N.L.R.B., Washington, D.C., on the brief), for petitioner. John A. Criswell, Englewood, Colo. (John Corbridge, Denver, Colo., on the brief), for respondent. Before MURRAH, Chief Judge, and HILL and HICKEY, Circuit Judges. HICKEY, Circuit Judge. The National Labor Relations