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| All Patents in class 361/237 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 291,650 | Jan. 08, 1884 | C.J. Van Depoele | Current Regulator for Electric Motors | ||
| 313,546 | Mar. 10, 1885 | F.J. Sprague | Electric Dynamic Motor | ||
| 531,790 | Jan. 01, 1895 | R. Eickemeyer | Method of operating or controlling electric motors or dynamos | ||