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| All Patents in class 384/611 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,830,679 | Nov. 03, 1931 | C.F. Schenck | Drill spindle | drill presses | |
| 1,960,442 | May 29, 1934 | D.C. Klausmeyer | Adjustable spring mount and clamp for radial drill sleeves | radial drill presses | |