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| Patents Granted on 1833-02-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,436X | Feb. 21, 1833 | F.G. Clarke | Improvement on Spear's quadrant | ||
| 7,437X | Feb. 21, 1833 | J. McDuffee | Hanging and using stones | mill stones | |