In circuit court of appeals for 7th circuit, Triangle Conduit & Cable Co., Inc., and M. B. Austin Company, no. 8639, Enameled Metals Company and Lawrence R. Quinn, no. 8640, Clayton Mark & Company, et al., no. 8642, General Electric Company and General Electric Supply Corporation, no. 8644, Spang Chalfant, Inc., and H. G. Morrow, no. 8649, v. Federal Trade Commission; brief for respondent.