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| Patents for Ewing W. Hamlen | |||||
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| Number | Date | Patentee | Title | Type | |
| 453,033 | May 26, 1891 | J.G. Blount | Speed-controlling device | industrial machine mechanisms | |
| 555,442 | Feb. 25, 1896 | W.L. Fifield | Chain Drill | drill chucks | |