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All Patents in class 137/523
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	290,450	Dec. 18, 1883	C. Ahrens	Safety-valve
	395,536	Jan. 01, 1889	H.G. Ashton	Safety-valve
	1,375,497	Apr. 19, 1921	E.H. Eickman	Valve

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