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| All Patents in class 204/228.1 | |||||
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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 | |
| 3,004,910 | Oct. 17, 1961 | G.F. Keeleric | Apparatus for electrolytic cutting, shaping and grinding | electrochemical machining | |