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| Patents Granted on 1830-04-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,928X | Apr. 21, 1830 | H.M. Shreve | Steam boilers | stationary boilers | |
| NX-183,004,211 | Apr. 21, 1830 | D. Barnard | Cast iron plough | plows | |