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All Patents in class 417/182
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	2,625,797	Jan. 20, 1953	J.H. Shaver, H.H. Poort	Hydraulic eductor valve
	3,057,417	Oct. 09, 1962	R.L. Sandvig	Drill system with suction removal of cuttings

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