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| Patents for Duff Machine Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 529,023 | Nov. 13, 1894 | J.W. Duff | Rotary support for hand drills | ||
| 1,109,516 | Sep. 01, 1914 | J. Dalton | Hand-operated drill | hand drills | |