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All Patents in class 137/475
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	536,693	Apr. 02, 1895	R. Gould	Safety-valve
	921,360	May 11, 1909	F. Casey	Safety-Valve
	2,001,375	May 14, 1935	H.S. Baker	Safety Valve

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