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| Patents Granted on 1821-12-07 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,416X | Dec. 07, 1821 | B. Marshall | Machine used in the medicated steam bath | ||
| 3,417X | Dec. 07, 1821 | J. Barron | Washing machine | washing machines | |
| 3,418X | Dec. 07, 1821 | W. Hart | Setting saw teeth | saw sets | |