Importation of goods covered by United States patents (process patents on phosphate rock)
Subtitle: hearings before the Committee on Patents, Subcommittee on Phosphate Rock Process Patents, House of Representatives, Seventy-fifth Congress, third session, on H.R. 7851, May 5, 1938.
Publisher: U.S. Govt. print. off.
Published: 1938
Place of publication: Washington
Language: eng
Number of pages: 110
Subjects: Phosphates -- United States; Patent laws and legislation -- United States.