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| Patents Granted on 1821-11-10 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,400X | Nov. 10, 1821 | C.M. Graham | Improvement in fire grates, called the caloret | household tools | |
| 3,401X | Nov. 10, 1821 | J. Humes | Machine for digging canals, roads, etc. | ||