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| All Patents in class 219/69.17 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,773,968 | Dec. 11, 1956 | J.W. Evans, M.E. Martellotti | Electro Discharge Machine | ||
| 2,778,924 | Jan. 22, 1957 | J.P. Hill | Apparatus and method for producing flat surfaces | ||
| 3,052,013 | Sep. 04, 1962 | W.B. Kane | Valve and Method of Manufacture | ||
| 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 | ||