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All Patents in class 175/391
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	47,812	May 23, 1865	W.W. Grier, R.H. Boyd	Improved drill-bit
	305,994	Sep. 30, 1884	J.T. Baggs, A.J. Baggs	Coal-mining machine
	432,705	Jul. 22, 1890	A.V. Hartle	Earth Auger

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