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All Patents in class 451/375
Patents 1 - 15 of 39
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NumberDatePatenteeTitleType
141,760Aug. 12, 1873S.W. CardMachines for milling twist-drillsmetal threading machines
183,798Oct. 31, 1876A.F. ChamplinImprovement in Tools for Sharpening Drillsbench or pedestal grinders
201,449Mar. 19, 1878A.K. RiderDrill Grinderdrill grinders
230,715Aug. 03, 1880I.L. PenneyGrinding Twist Drillstool grinders
299,433May 27, 1884A. Coventry, W.F. SmithMachinery for Grinding or Sharpening Drillsdrill grinders
407,577Jul. 23, 1889J.D. Cox, Jr.Machine for back-clearing twist-drillstool making machines
425,839Apr. 15, 1890O.S. WalkerTwist-drill-grinding machinesharpening machines
428,426May 20, 1890J.H. Storey, H.J. BamfordMachine for grinding twist or other drillssharpening machines
508,268Nov. 07, 1893J.S. BancroftMachine for Sharpening Drillsdrill grinders
607,306Jul. 12, 1898O.S. WalkerTwist-drill-grinding machinedrill grinders
613,127Oct. 25, 1898W. EamesTwist Drill Grinderdrill grinders
614,092Nov. 15, 1898G.T. EamesDrill-grinderdrill sharpening machines
622,212Apr. 04, 1899R. DuttonTwist-drill grinderdrill grinders
630,536Aug. 08, 1899L.S. Heald, J.N. HealdDrill-grinding machinesharpening machines
643,703Feb. 20, 1900H.P. WhiteDrill-grinding machinesdrill sharpening machines
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