http://otiselevator.umwblogs.org/files/2011/03/cropped-IMG_5752.jpg
https://en.wikipedia.org/wiki/Elevator
http://www.engineersgarage.com/invention-stories/elevator-history
http://nypost.com/2014/02/08/how-elevators-transformed-nycs-social-landscape/
http://otiselevator.umwblogs.org/impact/
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