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| All Patents in class 388/849 | |||||
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| Number | Date | Patentee | Title | Type | |
| 757,394 | Apr. 12, 1904 | R. Eickemeyer | Means for variably operating and controlling electric motors | ||
| 1,115,835 | Nov. 03, 1914 | J.D. Nies, A. Kimble | Electric controller | electrical devices | |