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.
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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identifier
2000093599
created
2015-04-02T09:19:46
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title
United States Patent Office. D ...... ernment Printing Office, 1912.
shortTitle
U.S. Patent Office, Definitions of Revised Classes (1912)