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| All Patents in class 310/186 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 324,891 | Aug. 25, 1885 | F.J. Sprague | Electric Dynamic Motor | ||
 | 847,088 | Mar. 12, 1907 | J.C. Lincoln | Variable Speed Electric Motor | |
 | 1,118,928 | Dec. 01, 1914 | V.A. Fynn | Dynamo-electric machine | |