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Some trivia that might help to understand this video
- An elevator or lift is a transport device used to move goods or people vertically. - Primitive elevators were in use as early as the 3rd century BC, operated by human, animal, or water wheel power. Information sources: http://science.howstuffworks.com/elevator.htm, http://en.wikipedia.org/, http://inventors.about.com/library/inventors/blelevator.htm |