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All Patents of Type: metalworking twist drills
Patents 1 - 4 of 4
First set of recordsLast set of records
74,870Feb. 25, 1868P.A. WhitneyDrill and Countersinkmetalworking countersinks
854,144May 21, 1907P. BroadbooksDrill Bitmetalworking twist drills
867,639Oct. 08, 1907G.J. BraggTwist Drillmetalworking twist drills
1,264,370Apr. 30, 1918L. GroffDrillmetalworking twist drills
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