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All Patents in class 417/303
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,888,866	Nov. 22, 1932	P.S. Russel	Control Means
	2,100,997	Nov. 30, 1937	P.S. Russel	Pressure Control Device
	2,497,247	Feb. 14, 1950	A. Von Wangenheim	Pump and Pressure Regulating Unit

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