Classification Bulletin of the United States Patent Office from ... United States. Patent Office Published: 1915 Total Pages: 1154 Get eBook
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Official Gazette of the United States Patent Office United States. Patent Office Published: 1919 Total Pages: 812 Get eBook
Official Gazette of the United States Patent and Trademark Office United States. Patent and Trademark Office Published: 1875 Total Pages: 1006 Get eBook
Manual of Classification of Subjects of Invention of the United States Patent Office United States. Patent Office Published: 1920 Total Pages: 316 Get eBook
Official Gazette of the United States Patent Office USA Patent Office Published: 1875 Total Pages: 1012 Get eBook