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| All Patents in class 310/192 | |||||
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| Number | Date | Patentee | Title | Type | |
| 228,763 | Jun. 15, 1880 | N.S. Keith | Dynamo-Electrical Machine | electric motors | |
| 829,975 | Sep. 04, 1906 | J.C. Lincoln | Variable Speed Electric Motor | DC motors | |