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| All Patents in class 318/808 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,878,445 | Apr. 15, 1975 | R. Stobbe, F. Zankl, E.E. Kirkham, J.J. Schachte | A.C. Motor Control Apparatus and Method (CNC Control Circuitry) | machine tool controls | |
| 4,091,294 | May 23, 1978 | F. Zankl, E.E. Kirkham, R.E. Stobbe, J.J. Schachte | A.C. Motor Control Apparatus and Method | motor controls | |