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| All Patents in class 315/227A | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 15,062 | Jun. 10, 1856 | J.M. Carlisle | Method of operating head-blocks of sawmills | |
| 3,206,639 | Sep. 14, 1965 | R.L. Henry | Electrical Discharge Machining Apparatus | ||
| 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 | ||