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All Patents in class 251/289
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	755,734	Mar. 29, 1904	T. Barrow	Valve Operating Mechanism
	2,849,206	Aug. 26, 1958	A.P. Waterson	Hydraulic tracer control valve
	3,084,899	Apr. 09, 1963	L.A. Dever, C.L. Gschwind	Manual Three Direction Tracer

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