No. 10305. Heard April 23, 1951. Decided May 21, 1951. David P. Findling, Associate General Counsel, A. Norman Somers, Asst. General Counsel, N.L.R.B., Washington, D.C., Robert E. Ackerberg, National Labor Relations Board, Chicago, Ill., George J. Bott, Associate General Counsel, Frederick U. Reel, and Maurice Alexandre, Attorneys, National Labor Relations Board, all of Washington, D.C., for petitioner. Kenneth F. Burgess, Howard P. Robinson, Gordon W. Winks, and Arthur R. Seder, Jr., all of Chicago