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| Patents Granted on 1826-04-19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,404X | Apr. 19, 1826 | T. Fairbanks | Cast iron plough | plows | |
| 4,405X | Apr. 19, 1826 | R. Wilcox | Conical water wheel | turbine water wheels | |