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All Patents in class 137/477
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,696,452	Dec. 25, 1928	F.E. Raymond	Valve
	2,355,916	Aug. 15, 1944	E. Klafstad	Relief Valve
	2,414,794	Jan. 28, 1947	T.W. Bergquist	Safety valve

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