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All Patents in class 175/420.1
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,673,714	Mar. 30, 1954	J.M. Hargrave	Rock or masonry drill
	2,919,902	Jan. 05, 1960	M.J. Steffes	Masonry drill
	4,595,322	Jun. 17, 1986	B. Clement	Spade drill bit

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