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| All Patents in class 388/827 | |||||
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| Number | Date | Patentee | Title | Type | |
| 390,820 | Oct. 09, 1888 | N. Tesla | Regulator for Alternate-Current Motors | ||
| 838,547 | Dec. 18, 1906 | A. Kimble | Electric motor and method of controlling the same | electric motors | |