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| All Patents in class 204/212 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,194,751 | Jul. 13, 1965 | S.G. Brady | Electrolytic Grinder Wheel | grinder wheels | |
| 3,345,281 | Oct. 03, 1967 | J.J. Falls | Electrolytic shaping apparatus | electrochemical machining | |
| 3,499,830 | Mar. 10, 1970 | W.A. Haggerty, C.E. Foertmeyer | Apparatus for electrochemically forming and finishing gears | electrochemical machining | |