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All Patents in class 409/72
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	166,121	Jul. 27, 1875	B.A. Mason	Machine for Threading Wood Screws
	1,273,904	Jul. 30, 1918	F. Müller	Tap Making Machine
	1,659,247	Feb. 14, 1928	J.A. Doane	Full Automatic Thread Hobbing Machine

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