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| Patents Granted on 1820-06-17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,209X | Jun. 17, 1820 | L.S. Parmly | Composition for cleansing and preserving teeth | ||
| 3,210X | Jun. 17, 1820 | D. Coit | Improvement on his Family pills | ||