All Patents in class 137/469


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All Patents in class 137/469
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	69,527	Oct. 01, 1867	G. Smith, J.N. Wrigley	Improvement in steam safety-valves
	306,208	Oct. 07, 1884	R. Gould, H.G. Ashton	Safety Valves
	2,183,650	Dec. 19, 1939	G.L. Gundersen, E. Klafstad	Relief Valve
	2,792,015	May 14, 1957	R.V. Smith	Liquid relief valve
	2,815,040	Dec. 03, 1957	R.V. Smith	Pressure relief valve