Index to the U.S. patent classification

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Bibliographic Details
Previous Title:United States. Patent Office. Index to classification
Corporate Authors: United States. Patent and Trademark Office, United States. Patent and Trademark Office. Office of Classification Support
Format: Serial
Language:English
Published: [Washington, D.C.] : U.S. Dept. of Commerce, Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor,
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