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| Patents Granted on 1820-11-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,254X | Nov. 21, 1820 | J. Brown | Winnowing machine | winnowing machines | |
| 3,255X | Nov. 21, 1820 | C.G. Barstow | Machine for making ramrods | gunsmith | |