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| All Patents in class 318/821 | |||||
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| Number | Date | Patentee | Title | Type | |
| 455,067 | Jun. 30, 1891 | N. Tesla | Electro-magnetic motor | multiphase motors | |
| 1,587,760 | Jun. 08, 1926 | E.L. Connell | Electric motor | handheld power drills | |