elevators.
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Elevators and cheap steel. Henry Bessemer invented the first process for mass producing steel at lower costs, and in 11852, Elisha Otis introduced the first safety elevator that allowed for more convenient ways to get to the upper floors.
elivator
One technology that made skyscrapers possible would be the elevator. The other, I suspect is structural steel.
STEEL! Elevators Telephones Efficient pumps
Among them were the ability to mass produce steel, the invention of safe and efficient elevators, and the development of improved techniques for measuring and analyzing structural loads and stresses.