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Patents for American Twist Drill Co.
Patents 1 - 7 of 7
First set of recordsLast set of records
NumberDatePatenteeTitleType
D3,603Aug. 03, 1869T.H. WorrallDesign for a grinding-machinebench or pedestal grinders
463,812Nov. 24, 1891A. LesperanceClutchmetalworking power transmission
463,820Nov. 24, 1891T.H. Worrall, A. LesperanceClutchmetalworking power transmission
559,558May 05, 1896T.H. Worrall, A. LesperanceFriction-clutchmetalworking power transmission
586,263Jul. 13, 1897T.H. Worrall, A. LesperancePower-shifting device for clutch mechanismsmetalworking power transmission
606,634Jun. 28, 1898T.H. Worrall, A. LesperanceFriction-clutchmetalworking power transmission
834,857Oct. 30, 1906T.H. WorrallClutchmetalworking power transmission
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