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| All Patents in class 310/216.121 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,115,440 | Oct. 27, 1914 | F.R. Kunkel | Dynamo-electric machine | electric motors | |
| 2,767,339 | Oct. 16, 1956 | D.O. Hatfield | Dynamoelectric rotor | synchronous motors | |