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| All Patents in class 388/831 | |||||
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| Number | Date | Patentee | Title | Type | |
| 298,550 | May 13, 1884 | C.G. Burke | Regulator for Electric Motors | motor regulators | |
| 2,926,295 | Feb. 23, 1960 | K.C. Allen | Pulsing motor system | ||