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| All Patents in class 29/DIG.68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 157,700 | Dec. 15, 1874 | C. Sellers | Machines for Threading Bolts | ||
| 1,442,149 | Jan. 16, 1923 | H.J. Hjorth | Drilling Machine | drill presses | |