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