Serial no. 10, 80th Congress. 10. Authorizing composer's royalty in revenues from coin-operated machines and to establish right of copyright in artistic interpretations, hearings before subcommittee on patents, trade-marks, and copyrights, 80th Congress, 1st session, on H. R. 1269, H. R. 1270, and H. R. 2570, May 23-June 23, 1947.