Repeal of price-fixing clause for mechanical reproduction : hearings held before the Committee on Patents, House of Representatives, Seventieth Congress, first session on H. R. 10655, a bill to amend sections 1 (E) and 25 (E) of the act entitled "An act to amend and consolidate the acts respecting copyright" approved March 4, 1909, April 3, 4, 10, and 11, 1928