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Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office. Arranged in Numerical Order. a Supplement to the Manual of Classification. Rev. to January 1

Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office. Arranged in Numerical Order. a Supplement to the Manual of Classification. Rev. to January 1

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United States. Patent Office

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