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| Patents for Thomas L. J. Douglas | |||||
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| Number | Date | Patentee | Title | Type | |
| 42,616 | May 03, 1864 | W. Wright | Improved machine for boring curved cylinders | drilling and boring | |
| 42,691 | May 10, 1864 | A. Schwitter | Improvement in rose-engines | ornamental lathes | |