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All Patents in class 476/48
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,017,877	Feb. 20, 1912	A.B. Landis	Change-speed gearing
	2,617,309	Nov. 11, 1952	W.G. Tyson, K.H. Casson	Variable-speed friction drive

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