Serial no. 8-9, 12, 80th Congress. 12. Extension of patents in certain cases, hearings before subcommittee on patents, trade-marks and copyrights, 80th Congress, 1st session, on H. R. 65, H. R. 124, H. R. 1107, H. R. 1984, Apr. 2-May 14, 1947.

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