No. 75-1547. Submitted February 11, 1976. Decided February 17, 1976. Rody P. Biggert, Seyfarth, Shaw, Fair-weather Geraldson, Chicago, Ill., made argument for petitioner. He also filed appendix, brief and reply brief for petitioner. Andrew Tranovich, Atty., N.L.R.B., Washington, D.C., made argument for respondent. Brief was filed for respondent in this Court. Counsel appearing on brief are: John C. Miller, Acting Gen. Counsel, John S. Irving Jr., Deputy Gen. Counsel, Elliott Moore, Deputy Associate