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| Patents Granted on 1821-11-17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,406X | Nov. 17, 1821 | O. Phelps | Elastic floor for propelling boats | nautical propulsion apparatus | |
| 3,407X | Nov. 17, 1821 | G. Moorehouse, O. Phelps | Plough | plows | |