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

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