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| Patents Granted on 1831-03-12 | |||||
| Number | Date | Patentee | Title | Type | |
| 6,417X | Mar. 12, 1831 | J. Conger, G. Detterich | Weaving figured cloth | ||
| 6,418X | Mar. 12, 1831 | J. Morrison | Wood screws for pressing hay, cider, and cotton | cotton presses | |
| 6,419X | Mar. 12, 1831 | S. Stimpson | Making paper | ||