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OpenStudy (anonymous):

Who designed an elevator that made it possible for people to move easily from floor to floor in a skyscraper

OpenStudy (confluxepic):

@sabmike2

OpenStudy (confluxepic):

http://en.wikipedia.org/wiki/Elevator

OpenStudy (confluxepic):

@~

OpenStudy (confluxepic):

German engineer Konrad Kyeser.

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