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All Patents in class 451/268
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,281,366	Oct. 15, 1918	L.R. Heim	Method of Grinding Hardened Rolls
	1,644,057	Oct. 04, 1927	L.R. Heim	Grinding Machine
	1,949,514	Mar. 06, 1934	F.W. Elstub	Machine for and method of lapping the ends of round work pieces

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