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| All Patents in class 204/224R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,919,522 | Jan. 05, 1960 | P.J. Robischung | Electrolytic grinding machine | ||
| 3,324,022 | Jun. 06, 1967 | G.F. Keeleric | Apparatus for Shaping Metals by Electrolytic Means | ||