http://www.pbs.org/wgbh/theymadeamerica/whomade/otis_hi.html
http://www.ideafinder.com/history/inventions/elevator.htm
http://www.ideafinder.com/features/smallstep/index.htm
http://www.otis.com/_layouts/ProjectNewsPopup.aspx?ID=22&siteURL=http://www.otis.com/site/in/Pages/default.aspx
http://www.eastindiaelevators.com/bungalow-elevators.html
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