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| Patents Granted on 1821-08-11 | |||||
| Number | Date | Patentee | Title | Type | |
| 3,364X | Aug. 11, 1821 | J. Grant | Machine for setting up hats | milliner | |
| 3,365X | Aug. 11, 1821 | B. Taber | Machine for mincing whale's blubber | ||
| 3,366X | Aug. 11, 1821 | J. Brown | Vertical spinner | spinner | |