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| Patents Granted on 1820-02-17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,173X | Feb. 17, 1820 | J. Kelly, A. Buffum | Elastic water proof hats | ||
| 3,174X | Feb. 17, 1820 | J. Williams | Makring spruce beer | ||