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All Patents in class 175/255
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	9,961	Aug. 23, 1853	L.A. Walbach	Boring cannon
	1,254,268	Jan. 22, 1918	R.O. Pickin	Core Drill
	1,281,140	Oct. 08, 1918	W.R. Guiberson, R.A. Conkling	Drill

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