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| Patents Granted on 1804-02-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 521X | Feb. 21, 1804 | I. Wood | In Setting Stills and Other Large Kettles | distilling | |
| 522X | Feb. 21, 1804 | T. Barnett | Thresher | threshers and thrashers | |
| 523X | Feb. 21, 1804 | T. Pierce | Smut Mill | smut mills | |