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Patents for Union Twist Drill Co.
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
286,663Oct. 16, 1883H.F. WheelerGrinding Machine for Producing the Relief on Twist and Fluted Drillstool grinders
1,052,605Feb. 11, 1913S. MacKayGrinding Machinesharpening machines
1,052,649Feb. 11, 1913J.W. BoyntonGrinding Machinesharpening machines
1,079,420Nov. 25, 1913S. MacKayMethod of Adjusting Rotary Cutterssharpening machines
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