Definitions of revised classes and subclasses of subjects of invention in U.S. Patent Office, arranged in numerical order; supplement to Manual of classification, revised to Jan. 1, 1912.

Bibliographic Details
Corporate Author:	United States. Patent Office
Format:	Government Document eBook
Language:	English
Published:	Washington : U.S. GPO, 1912.
Subjects:	United States. > Patent Office. Classification. Patents. Electronic books.
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