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All Patents in class 470/73
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	150,687	May 12, 1874	H. Millward, J.L. Hall	Screw Cutting Machines
	311,099	Jan. 20, 1885	E.P. Baville	Machine for Threading Screws Bolts and Nuts
	872,728	Dec. 03, 1907	J. Hartness	Machine for Cutting Screw Threads

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