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| Patents Granted on 1824-04-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,852X | Apr. 20, 1824 | R. Wilcox | Door and other locks | ||
| NX-182,404,201 | Apr. 20, 1824 | J. Moon | Corn shelling machine | corn shellers | |