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All Patents in class 175/426
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	224,530	Feb. 17, 1880	W. Hasenzahl	Boring Tool for Stone Working
	2,969,122	Jan. 24, 1961	M.J. Steffes	Masonry drill
	2,969,846	Jan. 31, 1961	R.L. Sandvig	Percussive drill bit for use in reverse flow flushing is soft rock drilling

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