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| All Patents in class 327/535 | |||||
| Picture | Number | Date | Patentee | Title | |
| 3,286,127 | Nov. 15, 1966 | R.L. Henry | Electric Discharge Machining Apparatus with Current Control Means | ||
| 3,304,488 | Feb. 14, 1967 | R. Zechlin, R.M. Henderson | Electronic Current Regulator | ||