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| Patents Granted on 1831-04-13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,474X | Apr. 13, 1831 | N.T. Loomis, J. Barnes | Corn shelling machine | corn shellers | |
| 6,475X | Apr. 13, 1831 | E.T. Cox, B.F. Lodge | Machine for breaking stone | stone dressing machines | |