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| Patents for Ellsworth B. Cooper | |||||
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| Number | Date | Patentee | Title | Type | |
| 279,917 | Jun. 26, 1883 | F.J. Colvin | Screw-Driver | screwdriver blades | |
| 518,938 | May 01, 1894 | F.J. Colvin | Articulating chuck with snap-in jaws | ||