392 U.S. 134 392 U.S. 134 88 S.Ct. 1981 20 L.Ed.2d 982 PERMA LIFE MUFFLERS, INC., et al., Petitioners,v.INTERNATIONAL PARTS CORP. et al. No. 733. Argued April 22 and 23, 1968. Decided June 10, 1968. Robert F. Rolnick, Washington, D.C., for petitioners. Glenn W. McGee, Chicago, Ill., for respondents. Mr. Justice BLACK delivered the opinion […]