All Patents in class 219/69.15


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All Patents in class 219/69.15
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
	2,778,925	Jan. 22, 1957	H. Gill, J.G. Gross	Electrical Discharge Cutting Machine
	2,797,299	Jun. 25, 1957	J.P. Hill	Method of forming serrations at the back of the blade of cutting elements