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Records 1 - 3 of 3 (maximum display and sort is 2000 records) | |||
# | Title | Year | Author | SuDoc Number | Internet Access | |
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1 | Index to the United States Patent Classification (USPC) system [electronic resource]. | 200u | C 21.12/2: | http://purl.access.gpo.gov/GPO/LPS69299 |
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2 | Index to the U.S. patent classification. | 1978 | United States.Patent and Trademark Office | C 21.12/2:977 | ||
3 | Index to the U.S. patent classification. | 1977 | C 21.12/2: | http://purl.access.gpo.gov/GPO/LPS69299 |