Engineering:Electric drill
From HandWiki
An electric drill 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, Australia who patented the electric drill in 1889.[1] In 1895, the first portable handheld drill was created by brothers 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". 1889. 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.
 |
