Definitions of Revised Classes And Subclasses of Subjects of Invention in the Un

Cover Definitions of Revised Classes And Subclasses of Subjects of Invention in the Un
Genres: Nonfiction
Arranged In Numerical Order. A Supplement To The Manual Of Classification. Revised To January 1, 1912.
Definitions of Revised Classes And Subclasses of Subjects of Invention in t...
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