Index to the U.S. patent classification. December 1980.
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| Corporate Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of Commerce, Patent and Trademark Office : [U.S. G.P.O.,
1981]
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| Subjects: | |
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3rd Floor Main Library
| Call Number: |
A1234.567 |
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| Copy 1 | Available |