No. 17978. December 14, 1965. As Corrected on Denial of Rehearing January 11, 1966. Gary Green, Attorney, N.L.R.B., Washington, D.C., Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel, and Marcel Mallet-Prevost, Asst. General Counsel, on the brief, for petitioner. Rex J. Ryden, of Cartwright, Druker, Ryden Fagg, Marshalltown; Iowa, H.G. Cartwright, of Cartwright, Druker, Ryden Fagg, Marshalltown, Iowa, for respondent. Before VOGEL, Chief Judge, and VAN OOSTERHOUT and MEHAFFY