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All Patents in class 175/392
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
47,812	May 23, 1865	W.W. Grier, R.H. Boyd	Improved drill-bit	drill bits
627,659	Jun. 27, 1899	F.B. Spry	Expanding Auger	auger bits
2,863,640	Dec. 09, 1958	G.A. Petersen	Offset Boring Head for Auger	well digging or drilling tools

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