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| Patents Granted on 1821-02-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,301X | Feb. 21, 1821 | I. Deaves | Making mantel pieces of cast iron or other soft metal | ||
| 3,302X | Feb. 21, 1821 | D. Vail | Mode of cleaning furs, wool, etc. | ||