All Patents in class 417/174


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All Patents in class 417/174
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	37,542	Jan. 27, 1863	N. Cope	Improvement in Giffard's injector
	677,866	Jul. 09, 1901	W.T. Harris	Apparatus for Returning Exhaust Steam to Steam Boilers