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| Patents for D. R. Lewis | |||||
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| Number | Date | Patentee | Title | Type | |
| RE1,946 | May 02, 1865 | W. Trapp, Jr. | Improvement in barrel-machinery | cooper | |
| RE1,947 | May 02, 1865 | W. Trapp, Jr. | Improvement in barrel-machinery | cooper | |