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| Patents for James Douglas | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,960X | May 14, 1830 | W. Johnson, J. Douglas | Thrashing machine | threshers and thrashers | |
| NF-34 | Apr. 23, 1869 | J. Douglas, T.S. Hunt | Improvement in the extraction of copper from its ore | ore processing apparatus | |