All Patents in class 431/171


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All Patents in class 431/171
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	825,779	Jul. 10, 1906	W.L. Doyle, E.J. Vraalstad	Hydrocarbon Furnace
	2,314,827	Mar. 23, 1943	R.M. Hortvet	Process for extracting pure nitrogen from air