All Patents in class 175/286


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All Patents in class 175/286
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	4,194	Sep. 17, 1845	R.A. Stratton, T.S. Speakman	Apparatus for Boring Rocks or Earth
	315,130	Apr. 07, 1885	J.W. Day, W.H. Davenport	Cutter Head for Rifling Machines
	410,311	Sep. 03, 1889	M.T. Chapman	Expansion Drill