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All Patents in class 417/270
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	924,787	Jun. 15, 1909	R. Janney	Variable Speed Transmission Device
	1,621,495	Mar. 22, 1927	C.M. Conradson	Rotary Pump
	2,164,888	Jul. 04, 1939	F.S. Haas, H. Ernst, B. Sassen	Variable Delivery Pump

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