Express Elevators To the Heavens

摘要

The Kingdom Tower in Jeddah, Saudi Arabia, is the first of a breed of ultratall buildings that will exceed 3,000 feet in height. That's more than twice as tall as New York's Empire State Building. United Technologies' Otis Elevator, Switzerland-based Schindler Group, and Finland's Kone are racing to perfect technologies ranging from stronger brakes to smarter software to move riders more efficiently and capture the market.