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All Patents in class 417/253
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,769,898	Jul. 01, 1930	W.E. Mathews	Unloading System for Compressors
	4,715,789	Dec. 29, 1987	R.D. Liegel, J.G. Ballard	High speed hydraulic fluid venting valve in a hydraulic fluid pump

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