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All Patents in class 279/43.7
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	234,624	Nov. 16, 1880	N. Spofford	Bit-brace
	5,337,521	Aug. 16, 1994	D. Heyl, D.M. Terpstra	Valve grinder

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