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All Patents in class 91/4R
Patents 1 - 6 of 6
Picture	Number	Date	Patentee	Title
	637,461	Nov. 21, 1899	J. Hartness	Fluid Operated Lathe
	789,556	May 09, 1905	G.C. Marx	Electric switch
	833,632	Oct. 16, 1906	W.H. Ridgway	Steam hydraulic hoist
	1,036,842	Aug. 27, 1912	C.L. Heisler	Valve Reversing Gear
	1,931,652	Oct. 24, 1933	R.E. Flanders	Hydraulically Operated Feed Mechanism for High Speed Machines
	2,979,903	Apr. 18, 1961	L.R. Beck	Air-hydraulic apparatus

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