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| All Patents in class 327/502 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,193,698 | Jul. 06, 1965 | R.M. Henderson, R. Zechlin | Transistor Controlled Speed Shunt | diesel locomotives | |
| 3,448,294 | Jun. 03, 1969 | R. Zechlin, R.M. Henry | Multiphase Power Switching Circuit | electronic circuitry and apparatus | |