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| Patents Granted on 1830-04-12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,911X | Apr. 12, 1830 | J. Cooper | Propelling Machinery by Animal Power | animal powered apparatus | |
| 5,912X | Apr. 12, 1830 | J. Cooper | Thrashing machine | threshers and thrashers | |