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Elevator - Wikipedia
UPS for elevator: uninterruptible power supply for lift use
Uninterruptible Power Supply - Definition from
What is Lift Inverter/UPS
Using UPSs to provide secondary power for emergency evacuation
Industrial or Commercial Uninterruptible Power Supply System
Backup Power Requirements for Elevators - Thompson Power Systems
Understanding the Differences in Industrial and Commercial
Lift UPS: The Ultimate Backup Solution for Power Failure in Lifts