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| Patents Granted on 1824-05-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,875X | May 21, 1824 | W.J. Hart | Machine for hulling grain | grain hullers | |
| 3,876X | May 21, 1824 | A. Watkins | Construction of rudders for vessels | ||