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| Patents Granted on 1831-04-29 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,526X | Apr. 29, 1831 | J.J. Giraud | Propelling vessels by screw or spiral lever | ||
| 6,527X | Apr. 29, 1831 | P. Newton | Gumming saws | saw sharpening machines | |