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Definitions of Revised Classes and Subclasses of Subjects of Invention in the United States Patent Office
Language: en
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Authors: United States. Patent Office
Categories: Patents
Type: BOOK - Published: 1912 - Publisher:

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Manual of Classification of Subjects of Invention of the United States Patent Office
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Manual of Classification of Subjects of Invention of the United States Patent Office

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Authors: United States. Patent Office
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