Patents and Trade-marks: Hearings Before the Committee on Patents, House of Representatives, Seventy-sixth Congress, First Session, on H.R. 6618, Trade-marks, H.R. 6721, Classification of Patents, H.R. 6877, to Protect the United States in Patent Infringement Suits, H.R. 6872, H.R. 6873, H.R. 6874, H.R. 6875, and H.R. 8678, Amending Patent Laws. June 22, 1939
United States. Congress. House. Committee on Patents
Jan 1939 · U.S. Government Printing Office