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| All Patents in class 322/4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 865,814 | Sep. 10, 1907 | W.H. Powell | Motor-control system | motor controls | |
| 3,305,762 | Feb. 21, 1967 | C.E. Geib, Jr. | Method of control of electric power | motor controls | |