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| All Patents in class 318/534 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,617,970 | Nov. 11, 1952 | E.J. Justus | Traction Motor Control | ||
| 3,193,698 | Jul. 06, 1965 | R.M. Henderson, R. Zechlin | Transistor Controlled Speed Shunt | ||