Index to the U.S. patent classification system
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Index to the U.S. patent classification system
U.S. Dept. of Commerce, Patent and Trademark Office , Supt. of Docs., U.S. G.P.O. [distributor]
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Index to the United States patent classification
Index to the U.S. patent classification
Index to the US patent classification
Index to the U.S. patent classification
Index to classification
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注記
Description based on: 1992
Began with Dec. 1977
Title varies: Index to the U.S. patent classification, <-1990>
Vols. for <1993-> issued by: U.S. Dept. of Commerce, U.S. Patent and Trademark Office, Assistant Secretary and Commissioner of Patents and Trademarks, Office of Classification Support
Companion to: United States. Patent and Trademark Office. Manual of classification
Continues(CF):United States. Patent Office. Index to classification. CN:(OCoLC)4788197.