Manual of classification of subjects of invention of the United States Patent office
Rev. to January 1, 1920 (including classification bulletin no. 43)
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Publication
1920 - Govt. print. off., Washington, District of Columbia
Language
English
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Identifiers
- OCLC Control Number9962649
- Library of Congress Control Number20026743
- Open LibraryOL52858945M
Classifications
- LCCT223 .F 1920
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