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| Patents for Michael Marhoefer | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,540,928 | Sep. 10, 1985 | M. Marhoefer | Closed loop resonance compensation circuit for stepper motors | electric motors | |
| 4,651,076 | Mar. 17, 1987 | N.E. Oltendorf, M. Marhoefer | Power maximizing circuit for stepper motors | electric motors | |