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| Patents Granted on 1831-04-15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,480X | Apr. 15, 1831 | S. Andrews | Generating gas and continuing light from oil | ||
| 6,481X | Apr. 15, 1831 | J.R. Deming | Mode of constructing ships | boats and ships | |