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All Patents in class 219/69.14
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	3,168,638	Feb. 02, 1965	M.J. Riddles	Method of Electro-Discharge Machining and Fluids for Use Therin
	3,334,210	Aug. 01, 1967	M.J. Riddles, J.L. Williams	Electro-Discharge Machining Fluid and Method
	5,177,335	Jan. 05, 1993	R.W. Ritchey, Jr., J.D. Hartwig	Prefilter for EDM machine

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