United States Patent and Trademark Office (COR)

United States Patent and Trademark Office (COR)

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Manual of Classification of Subjects of Invention of the United States Patent Office: Revised to January 1, 1912 (Including Classification Bulletin No. 27)7 % NR
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Manual of Classification of Subjects of Invention of the United States Patent Office: Revised to January 1, 1912 (Including Classification Bulletin No. 27)24 % NR
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