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All Patents in class 474/56
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	148,968	Mar. 24, 1874	W.C. Margedant	Improvement in expanding pulleys
	389,276	Sep. 11, 1888	H.W. Andrews, J.L. Yuly	Expanding Pulley
	1,496,032	Jun. 03, 1924	F.H. Sleeper	Pulley

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