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All Patents of Type: metalworking twist drills
Patents 1 - 11 of 11
First set of recordsLast set of records
NumberDatePatenteeTitleType
74,870Feb. 25, 1868P.A. WhitneyDrill and Countersinkmetalworking countersinks
339,544Apr. 06, 1886S.P. GrahamCombined boring-tool and holdermetalworking twist drills
CA-24,874Sep. 03, 1886S.P. GrahamCombined drill and bit shank and holdermetalworking twist drills
451,896May 05, 1891J.E. MerrittTwist Drillmetalworking twist drills
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
2,148,805Feb. 28, 1939S.A. CogsdillMethod of Making Oil Hole Drills metalworking twist drills
2,358,304Sep. 19, 1944S.A. CogsdillMethod of Making Oil Hole Twist Drills metalworking twist drills
2,555,302Jun. 05, 1951G.H. CogsdillTwist Drill metalworking twist drills
2,811,875Nov. 05, 1957S.A. CogsdillTwist Drill Having Oil Passages Therein and Method of Construction metalworking twist drills
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