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| Patents Granted on 1817-07-31 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,817X | Jul. 31, 1817 | J. Lupton | Angular plough | plows | |
| 2,818X | Jul. 31, 1817 | S.A. Rogers | Improvement on Dearborn's balance | ||