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All Patents in class 251/284
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	383,226	May 22, 1888	A.G. Hohenstein	Automatic pressure-regulator and safety-valve
	1,299,452	Apr. 08, 1919	R.W. Foster	Blow Off Valve
	2,634,086	Apr. 07, 1953	W.E. Johns	Valve with self-contained stem centering device

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