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| Patents for John Richard Witzel | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,988,560 | Oct. 26, 1976 | H.D. Kauffman, J.R. Witzel, J.E. Losey | Method and Apparatus for Controlling Generation of Machining Pulses in EDM Power Supply | electrical discharge machining | |