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All Patents in class 74/81
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,372,045	Mar. 22, 1921	R.G. Sedgewick	Valve grinder
	1,503,206	Jul. 29, 1924	A.W. Ojerholm	Combination valve grinder and drill
	2,937,732	May 24, 1960	S.G. Brady	Linear Indexing Mechanism

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