U.S. patent classification definitions
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| Previous Title: | United States. Patent and Trademark Office. Patent classification definitions |
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| Corporate Author: | |
| Format: | Government Document Online Microform Serial |
| Language: | English |
| Published: |
Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor.]
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| Subjects: | |
| Online Access: | http://purl.access.gpo.gov/GPO/LPS5132 |
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| Physical Description: | v. |
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