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| All Patents in class 318/461 | |||||
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| Number | Date | Patentee | Title | Type | |
| 289,197 | Nov. 27, 1883 | E. Weston | Safety Cut-Out for Electric Magnetic Motors | electric motors | |
| 1,662,660 | Mar. 13, 1928 | H.C. Clay | Controller for Variable Speed Transmission | industrial machine speed and direction changing mechanisms | |