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All Patents in class 175/421
Patents 1 - 6 of 6
Picture	Number	Date	Patentee	Title
	410,311	Sep. 03, 1889	M.T. Chapman	Expansion Drill
	632,764	Sep. 12, 1899	J. Stephens	Hollow auger
	900,044	Sep. 29, 1908	N.E. Swanson	Hollow Auger
	1,268,474	Jun. 04, 1918	J.G. Kilgore	Drill Bit
	1,273,724	Jul. 23, 1918	J.D. Boughner	Drill Rod Connection
	2,919,902	Jan. 05, 1960	M.J. Steffes	Masonry drill

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