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All Patents in class 251/324
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	70,784	Nov. 12, 1867	E.H. Bellows	Improvement in Slide Valves
	1,580,094	Apr. 06, 1926	A. White	Tool-operating machine
	2,145,977	Feb. 07, 1939	B.N. Foster	Solenoid actuated valve
	2,237,114	Apr. 01, 1941	E.C. Read	Valve
	2,686,650	Aug. 17, 1954	W.I. Evans	Hydraulic Tracing Mechanism

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