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All Patents in class 451/140
Patents 1 - 15 of 19
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NumberDatePatenteeTitleType
76,301Apr. 07, 1868E. Carrington, E.O. CarringtonImprovement in Machine for Grinding and Cutting Down Augersmaking drills and augers
293,398Feb. 12, 1884W.P. BarclayAbrading Toollathe tools
492,095Feb. 21, 1893P. MedartMachine for grinding pulley-shafts and their couplingsgrinders
513,632Jan. 30, 1894R. ConraderMachine for Grinding Spherical or Other Curved Surfacesgrinding machines
667,321Feb. 05, 1901M.L. KeyesEdge Tool Grindersharpening machines
1,683,859Sep. 11, 1928F.P. BrownGrinding machine
1,772,932Aug. 12, 1930S. EinsteinGrinding Machinerygrinding machines
1,847,045Feb. 23, 1932W.H. EvansReamer sharpening machinesharpening machines
1,891,663Dec. 20, 1932C. BoothGrinding Machinerygrinding machines
1,904,642Apr. 18, 1933C.G. HuntGrinding Machinegrinding machines
1,924,588Aug. 29, 1933T. AddisonGrinding Machinegrinding machines
1,938,757Dec. 12, 1933F.S. Haas, S. EinsteinGrinding Machinegrinding machines
1,972,316Sep. 04, 1934C.H. RandolphProcess of and apparatus for grinding internal surfaces of tubes
1,985,237Dec. 25, 1934C. BoothGrinding Machinegrinding machines
1,991,799Feb. 19, 1935C. Booth, S. EinsteinGrinding Machinegrinding machines
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