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| All Patents in class 388/806 | |||||
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| Number | Date | Patentee | Title | Type | |
| 551,371 | Dec. 17, 1895 | R. Eickemeyer | Means for operating and regulating speed of electric motors | ||
| 564,558 | Jul. 21, 1896 | R. Eickemeyer | Speed-regulator for electric motors | ||
| 2,864,047 | Dec. 09, 1958 | W.H. Ulman, C.E. Greene | Motor control system | ||