All Patents in class 29/55


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All Patents in class 29/55
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	120,044	Oct. 17, 1871	F. Curtis	Improvement in machines for making machine screws
	RE9,086	Feb. 17, 1880	F. Curtis	Machine for making machine-screws
	851,742	Apr. 30, 1907	W.H. Gates	Screw Machine