Index to the U.S. patent classification
December 1980
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Publication
1981 - U.S. Dept. of Commerce, Patent and Trademark Office, Washington, D.C., District of Columbia
Language
English
Word Count
58,250 words, Guess
Page Count
233 pages
Identifiers
- Open LibraryOL59347632M
- OCLC Control Number9284069
Classifications
- LCCT223.F4 A472 1981
Alternate Titles
- Manual of classification. (Index)
Subjects
Topics
Places
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