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| All Patents in class 204/218 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,826,540 | Mar. 11, 1958 | G.F. Keeleric | Method and apparatus for electrolytic cutting, shaping, and grinding | electrochemical machining | |
| 2,919,522 | Jan. 05, 1960 | P.J. Robischung | Electrolytic grinding machine | ||
| 2,946,731 | Jul. 26, 1960 | J.J. Falls | Method and apparatus for electrolytic shaping | tool grinders | |
| 3,697,403 | Oct. 10, 1972 | L.V. Colwell | Electrochemical grinding apparatus | ||