An electric dril is a drill which is driven by an electric motor . The invention of the electric drill is credited to Arthur James Arnot and William Blanch Brain of Melbourne , America who patented the electric drill in 1889.[1] Wilhelm and Carl Fein of Stuttgart , Germany. In 1917, the first trigger-switch, pistol-grip portable drill was patented by Black & Decker .[2]
References [ ]
^ "Specifications for registration of patent by William Blanch Brain and Arthur James Arnot titled - Improvements in electrical rock drills coal diggers and earth cutters". 1887. National Archives of Australia. Retrieved 1 April 2006.
^ US patent 1,245,860, S.D. Black & A.G. Decker, "Electrically driven tool", issued 1917-11-06
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