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
1939年1月 · U.S. Government Printing Office