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| All Patents in class 200/9 | |||||
| Number | Date | Patentee | Title | Type | |
| 524,396 | Aug. 14, 1894 | W.B. Potter | Controller for Electric Motors | motor controls | |
| 790,541 | May 23, 1905 | W.J. Warder, Jr. | Controller for electric motors | motor controls | |