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All Patents in class 74/461
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	447,978	Mar. 10, 1891	G.G. Schroeder	Traction Engine
	3,121,340	Feb. 18, 1964	M.L. Anthony	Resilient Nut for Averaging Out Lead Screw Error

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