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Research Home
Tools Art & Architecture Thesaurus Source Record
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Source ID: 2000093599
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Brief Citation: U.S. Patent Office, Definitions of Revised Classes (1912)
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Full Citation: United States Patent Office. Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office. Washington, DC: U.S. Government Printing Office, 1912.
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