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All Patents in class 137/625.31
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	443,107	Dec. 23, 1890	F.C. Olin	Balanced Govenor Valve
	519,639	May 08, 1894	E.S. Matthews	Hydraulic valve
	533,388	Jan. 29, 1895	H. Bolthoff	Register-valve
	2,912,011	Nov. 10, 1959	F.G. Burg	Valve structure
	3,067,768	Dec. 11, 1962	J.L. Burg	Temperature compensated hydraulic control device

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