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Otis 131HT is an Otis DC gearless traction machine. This machine was used from 1940s?-1980s?.

Elevator Machine Room Tour 1965 Otis Gearless Traction elevator Relay Logic Unit-104:20

Elevator Machine Room Tour 1965 Otis Gearless Traction elevator Relay Logic Unit-1

Otis 131HT machine in action

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