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| All Patents in class 204/206 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,905 | Feb. 09, 1886 | M.G. Farmer | Apparatus for Forming Sheet Metal by Electro Deposition | electrochemical machining | |
| 3,324,022 | Jun. 06, 1967 | G.F. Keeleric | Apparatus for Shaping Metals by Electrolytic Means | electrochemical machining | |