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| All Patents in class 204/225 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,442,785 | May 06, 1969 | A.T. Easton | Machine Electrolytic Grinding Tool Control Apparatus | ||
| 3,450,618 | Jun. 17, 1969 | D.E. Sutton | Face mill grinder | ||
| 3,499,830 | Mar. 10, 1970 | W.A. Haggerty, C.E. Foertmeyer | Apparatus for electrochemically forming and finishing gears | ||
| 3,697,403 | Oct. 10, 1972 | L.V. Colwell | Electrochemical grinding apparatus | ||