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All Patents in class 251/286
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	533,388	Jan. 29, 1895	H. Bolthoff	Register-valve
	1,174,211	Mar. 07, 1916	N.W. Whitbeck	Valve
	1,719,801	Jul. 02, 1929	G.B. Duffield	Valve
	2,167,433	Jul. 25, 1939	G.B. Duffield	Air Vent Valve

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