Answer:
'Otis Elevator Company, U.S.A. now a subsidiary of United Technologies Corporation, 'World's Largest Manufacturer of Vertical Transport System'. It is also 'World's Largest Maintainer of people-moving products including Elevators, Escalators and Moving Walkways'. There are approximately 2.3 million Otis elevators and escalators in operation worldwide.
Invention : Elevator
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