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All Patents in class 470/71
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
596,750	Jan. 04, 1898	J. Hartness	Screw Cutting Attachment	turret lathes
619,139	Feb. 07, 1899	C.F. Chase	Screw Cutting Apparatus	nut or bolt making machines
1,470,683	Oct. 16, 1923	R.A. Boehm	Screw Cutting Machine	screw machines

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