Kaehni v. Diffraction Company178 U.S.P.Q. (BNA) 321 4th Cir.1973Check Treatment473 F.2d 908 Kaehniv.Diffraction Company 72-1891 UNITED STATES COURT OF APPEALS Fourth Circuit 2/14/73 D.Md., 342 F.Supp. 523 AFFIRMED
