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| All Patents in class 318/676 | |||||
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| Number | Date | Patentee | Title | Type | |
| 714,786 | Dec. 02, 1902 | M.W. Day | Controlling Electric Motors | motor controls | |
| 1,963,827 | Jun. 19, 1934 | H.C. Clay | Variable Speed Unit Control | industrial machine speed and direction changing mechanisms | |