No. 74-1148. Argued January 15, 1975. Decided March 10, 1975. Mark A. Mancini, Washington, D.C., with whom Jack Wasserman and Benjamin M. Parker, Washington, D.C., were on the brief for appellants. Richard I. Chaifetz, Atty., Dept. of Justice, for appellee. Appeal from the United States District Court for the District of Columbia. Before LEVENTHAL and ROBINSON, Circuit Judges, and MARKEY, Chief Judge for the United States Court of Customs and Patent Appeals. Sitting by designation pursuant to 28