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| Patents Granted on 1820-10-02 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,236X | Oct. 02, 1820 | J. Prince (Priner) | Wheel for propelling boats | nautical propulsion apparatus | |
| 3,237X | Oct. 02, 1820 | D. Evans | Knapping hats with rabbits' fur | ||