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| All Patents in class 200/50.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 681,133 | Aug. 20, 1901 | T.S. Perkins | Starting Apparatus for Electric Motors | motor controls | |
| 1,434,752 | Nov. 07, 1922 | W.T. Sears | Interlocking mechanism for drilling machines | radial drill presses | |