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All Patents in class 251/57
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	192,273	Jun. 19, 1877	N.E. Nash	Steam-Engine Governor
	2,224,377	Dec. 10, 1940	G.H. Clark	Refrigerating Apparatus
	2,335,824	Nov. 30, 1943	E.J. Dillman	Valve
	2,493,297	Jan. 03, 1950	W.S. Landon	Orifice Cleaning Means

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