All Patents in class 237/68


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All Patents in class 237/68
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	266,462	Oct. 24, 1882	H. Hobbs, E.F. Gordon	Vent-valve
	587,291	Jul. 27, 1897	E.P. Holly	Water Return System for Steam Generators