Concordance, United States patent classification to international patent classification

書誌事項

Concordance, United States patent classification to international patent classification

U.S. Dept. of Commerce, Patent and Trademark Office, Patent Documentation Organizations , for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1980

4th ed

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注記

Second ed. issued by United States Patent Office, Office of Search Systems and Documentation

"January 1980."

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