Oldfield Revision and Codification of the Patent Statutes [electronic resource] : No. 20: hearings before the United States House Committee on Patents, Subcommittee No. 1 (Patents), Sixty-Second Congress, second session, on May 17, 1912
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Electronic reproduction. [Bethesda, Md.] : ProQuest, 2004. digital, PDF file. ProQuest U.S. Congressional Hearings Digital Collection. Mode of access: World Wide Web via ProQuest website.