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| All Patents in class 200/532 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,712,261 | May 07, 1929 | F.E. Farley | Switch for power drills | handheld power drills | |
| 2,627,567 | Feb. 03, 1953 | R.B. Bell | Switch | ||