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| All Patents in class 188/162 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,825,181 | Sep. 29, 1931 | W.C. De Roo | Electrical operated column clamp for radial drills | radial drill presses | |
| 1,945,048 | Jan. 30, 1934 | D.C. Klausmeyer | Electric rail clamp for mobile drills | radial drill presses | |