All Patents in class 173/60


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All Patents in class 173/60
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
2,919,901	Jan. 05, 1960	R.L. Sandvig	Drill system with suction
3,057,417	Oct. 09, 1962	R.L. Sandvig	Drill system with suction removal of cuttings