No. 19327. June 5, 1969. D.R. Newbrough, of Hegland, Newbrough, Johnston Brewer, Ames, Iowa, for petitioner; Daniel G. Jacobowski, of Jacobowski, Kenney Conway, St. Paul, Minn., with him on the brief and reply brief. Corinna Lothar Metcalf, Atty., N.L.R.B., Washington, D.C., for respondent; Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Nancy M. Sherman, Atty., N.L.R.B., with her on the brief. Before BLACKMUN, MEHAFFY and HEANEY