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| Patents Granted on 1827-07-16 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,820X | Jul. 16, 1827 | J.M. Cooper | Rotative piston | ||
| 4,821X | Jul. 16, 1827 | O. Phelps | Conveying earth or other substances from bottom of canals | ||