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| All Patents in class 318/693 | |||||
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| Number | Date | Patentee | Title | Type | |
| 714,786 | Dec. 02, 1902 | M.W. Day | Controlling Electric Motors | motor controls | |
| 2,473,572 | Jun. 21, 1949 | E.A. Ruchty, N.D. Cooper | Magnetic Servo Operator | metalworking machine mechanisms | |