All Patents in class 173/78


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All Patents in class 173/78
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
1,178,892	Apr. 11, 1916	D.S. Waugh	Rock Drill
1,279,532	Sep. 24, 1918	G.H. Gilman	Drilling Apparatus
3,057,417	Oct. 09, 1962	R.L. Sandvig	Drill system with suction removal of cuttings