Title: Contributory infringement
Subtitle: hearings before Subcommittee No. 4 of the Committee on the Judiciary, House of Representatives, eighty-first Congress, first session on H.R. 3866, a bill to provide for the protection of patent rights where enforcement against direct infringers is impracticable, to define "contributory infringement," and for other purposes. May 25 and June 3, 1949
Subjects: Patent laws and legislation