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| All Patents in class 310/177 | |||||
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| Number | Date | Patentee | Title | Type | |
| 228,763 | Jun. 15, 1880 | N.S. Keith | Dynamo-Electrical Machine | electric motors | |
| 324,667 | Aug. 18, 1885 | P. Diehl | Electric motor | DC motors | |
| 539,277 | May 14, 1895 | J.C. Lincoln | Electric Motor | DC motors | |