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| Patents Granted on 1831-11-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,837X | Nov. 12, 1831 | C. Hinkle | Elliptical steel springs | ||
| 6,838X | Nov. 12, 1831 | A. Kirkpatrick | Machine for mixing mortar | bricklayer | |