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All Patents in class 60/390
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,404,127	Jul. 16, 1946	H. Ernst	Sensitive Control Mechanism
	2,500,797	Mar. 14, 1950	E.P. Bullard	Positioning Apparatus
	4,706,456	Nov. 17, 1987	L.W. Durham, B.S. Backe	Method and Apparatus for Controlling Hydraulic Systems

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