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| All Patents in class 327/460 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,448,294 | Jun. 03, 1969 | R. Zechlin, R.M. Henry | Multiphase Power Switching Circuit | electronic circuitry and apparatus | |
| 3,596,157 | Jul. 27, 1971 | R. Zechlin | Oscillator Energized Motor Control | electronic circuitry and apparatus | |