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| Patents Granted on 1821-02-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,303X | Feb. 28, 1821 | J. Warren | Improvement in lamps for burning fat | lamps | |
| 3,305X | Feb. 28, 1821 | E. Southworth | Hydrometer | ||