Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office: Arranged in Numerical Order; A Supplement ... Revised to January 1, 1912 (Classic Reprint) - Couverture rigide

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9780365023333: Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office: Arranged in Numerical Order; A Supplement ... Revised to January 1, 1912 (Classic Reprint)

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