All Patents in class 148/581


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All Patents in class 148/581
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	125,650	Apr. 09, 1872	J.A. Woodbury	Improvement in Tempering Steel Railrod Rails
	2,867,556	Jan. 06, 1959	G.E. Tegen	Method of Flame Hardening