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Summary
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Example of early Additional Improvement Patent from 1838 | ||
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US patent AI4 | ||
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Licensing
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 14:16, 20 January 2007 | | 742 × 1,090 (36 KB) | Nowa (talk | contribs) | US patent AI4 |
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