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All Patents of Type: metalworking twist drills
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
74,870Feb. 25, 1868P.A. WhitneyDrill and Countersinkmetalworking countersinks
867,639Oct. 08, 1907G.J. BraggTwist Drillmetalworking twist drills
1,264,370Apr. 30, 1918L. GroffDrillmetalworking twist drills
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