Nos. 18357, 18463. March 5, 1970. George A. Burnstein, Philadelphia, Pa., Joseph L. Halberstein, Marion, Ohio, on brief; Kleinard, Bell Brecker, Philadelphia, Pa., Halberstein Mitchell, Marion, Ohio, of counsel, for petitioner Tennessee Products Chemical Corporation. William M. Ables, Jr., South Pittsburg, Tenn., W.D. Spears, Spears, Moore, Rebman Williams, Chattanooga, Tenn., on brief, for respondents, except Cardell Coal Co. and Tennessee Products Co. Vivian Asplund, N.L.R.B., Washington, D.C.