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All Patents in class 219/69.2
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
2,773,968	Dec. 11, 1956	J.W. Evans, M.E. Martellotti	Electro Discharge Machine	electrical discharge machining
2,826,540	Mar. 11, 1958	G.F. Keeleric	Method and apparatus for electrolytic cutting, shaping, and grinding	electrochemical machining
3,474,216	Oct. 21, 1969	J.M. Morgan, Jr.	Process Efficiency Detecting Circuit for Electrical Discharge Machining Apparatus	electrical discharge machining

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