No. 10888. Argued January 23, 1953. Decided April 15, 1953. Rehearing Denied May 7, 1953. Harvey B. Diamond, Washington, D.C. (George J. Bott, Gen. Counsel, David P. Findling, Associate Gen. Counsel, A. Norman Somers, Asst. Gen. Counsel, Bernard Dunau, Atty., National Labor Relations Board, Washington, D.C., on the brief), for petitioner. James M. Quigley, Harrisburg, Pa. (Samuel A. Schreckengaust, Jr., McNees, Wallace Nurick, Harrisburg, Pa., on the brief), for respondents. Before GOODRICH, STALEY