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| Patents Granted on 1831-10-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,804X | Oct. 20, 1831 | N. Phelps | Pump | pumps | |
| 6,805X | Oct. 20, 1831 | J.N. Robbins | Parturient invalid bedstead | ||
| 6,806X | Oct. 20, 1831 | J.L. Sullivan | Cemented pavement | ||