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All Patents in class 239/132.3
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	2,247,494	Jul. 01, 1941	A.L. Hartley	Flame hardening apparatus
	2,621,717	Dec. 16, 1952	M. Garvin, D.M. Strauchen	Annular Torch Head for Flame Hardening Machines

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