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| Patents Granted on 1806-04-17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 683X | Apr. 17, 1806 | J. Heavin | Propelling boats up rivers by cranks and setting poles | nautical propulsion apparatus | |
| 684X | Apr. 17, 1806 | J. Heavin | Machine for cutting straw | hay or straw cutters | |