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| Patents Granted on 1831-01-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| FX-6,346 | Jan. 21, 1831 | J.W. Dart, W. Webster | Propelling mills | industrial machine pulleys and belt drive mechanisms | |
| 6,346X | Jan. 21, 1831 | D. Marvin | Furnace for heating tire | tire heaters | |