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Index to the U.S. patent classification

Index to the U.S. patent classification - U.S. Dept. of Commerce, Patent and Trademark Office:

Description based on: 1980.

Subjects--Corporate Names:
United States Patent and Trademark Office Office of Documentation Planning and Support. Manual of classification

Subjects--Topical Terms:
Patents--Classification

GPO Item No.: 0257

Gov. Doc. Class. No.: C 21.12/2:

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