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| All Patents in class 219/69.13 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,286,127 | Nov. 15, 1966 | R.L. Henry | Electric Discharge Machining Apparatus with Current Control Means | ||
| 3,443,153 | May 06, 1969 | P.E. Berghausen | E. D. M. Power Supply with Current Adjusting Circuitry Responsive to Gap Condition | ||
| 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 | ||