Mbiri Yachitukuko Ya Elevator Yaku China Mu 1854, pa World Expo ku Crystal Palace, New York, Eliza Graves Otis adawonetsa kupanga kwake koyamba - kukweza chitetezo choyamba m'mbiri.Kuyambira nthawi imeneyo, zonyamula katundu zakhala zikugwiritsidwa ntchito kwambiri padziko lonse lapansi.Kampani ya elevator, yotchedwa Otis, ...
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