All Patents in class 175/398


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All Patents in class 175/398
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	RX-57	Oct. 20, 1843	L. Disbrow	Imrpovement in apparatus for boring earth for water
	224,530	Feb. 17, 1880	W. Hasenzahl	Boring Tool for Stone Working
	627,659	Jun. 27, 1899	F.B. Spry	Expanding Auger
	2,088,197	Jul. 27, 1937	C.L. Gairoard	Brick and Stone Drill
	2,919,902	Jan. 05, 1960	M.J. Steffes	Masonry drill