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| Patents for John Dempsey | |||||
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| Number | Date | Patentee | Title | Type | |
| 455,490 | Jul. 07, 1891 | C.T. Pratt | Drill-chuck | drill press chucks | |
| 455,689 | Jul. 07, 1891 | C.T. Pratt | Drill-chuck | drill press chucks | |