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All Patents in class 137/476
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,222,071	Apr. 10, 1917	G.H. Clark	Safety Valve
	1,696,452	Dec. 25, 1928	F.E. Raymond	Valve
	2,414,794	Jan. 28, 1947	T.W. Bergquist	Safety valve

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