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| All Patents in class 310/69 | |||||
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| Number | Date | Patentee | Title | Type | |
| 468,451 | Feb. 09, 1892 | J. Hunt | Magneto-electric machine | mining apparatus | |
| 693,837 | Feb. 25, 1902 | W.E. Canedy | Motor-gearing | ||
| 908,726 | Jan. 05, 1909 | F.J. Backscheider | Portable electric tool | handheld power drills | |
| 2,232,452 | Feb. 18, 1941 | K.A. Harmon | Magneto | ignition systems | |