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| All Patents in class 29/DIG.71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 465,478 | Dec. 22, 1891 | A. Johnston | Grinding Machine | sharpening apparatus | |
| 1,442,149 | Jan. 16, 1923 | H.J. Hjorth | Drilling Machine | drill presses | |