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I manage a building in San Fran that was built in 1907. The Otis elevator is original to the building and serves 6 floors including the basement. It runs 24/7, a "working museum piece", serviced once a month by contract. Oldest patent date on the data plate is 1889. It's a birdcage type with pantograph doors just like in the movie Titanic (where the steerage people were trying to break through). Runs on 230V DC and PG&E has a rectifier station supplying DC exclusively for these old elevators of which there are quite a few in the city.
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