All Patents in class 137/508


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All Patents in class 137/508
Patents 1 - 6 of 6
Picture	Number	Date	Patentee	Title
	8,923	May 04, 1852	J. McClintic	Differential safety-valve
	69,527	Oct. 01, 1867	G. Smith, J.N. Wrigley	Improvement in steam safety-valves
	2,071,143	Feb. 16, 1937	L.l. Scott	Automatic Valve
	2,100,997	Nov. 30, 1937	P.S. Russel	Pressure Control Device
	2,123,826	Jul. 12, 1938	E.J. Dillman	Nozzle
	2,460,048	Jan. 25, 1949	A. Von Wangenheim	Pressure Regulating Means