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| Patents Granted on 1834-04-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,143X | Apr. 12, 1834 | T. Newhall, Jr. | Preventing explosions in boilers | stationary boilers | |
| 8,144X | Apr. 12, 1834 | T. Waterbury, L. Waterbury | Water shoot and driving wheel | water wheels | |