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| Patents Granted on 1820-04-06 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,194X | Apr. 06, 1820 | P.H. Merrill | Common hoe | hoes | |
| 3,195X | Apr. 06, 1820 | S. Gillet (Gillett, Amr. Of S.) | Double forcing pump | pumps | |