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What does the elevator button mark PB stand for in Spanish-speaking Countries?

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PB means Planta Baja (lower level)
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How do elevator buttons work?

When you press the button, a microswitch creates a circuit. That circuit sends a signal to the elevator controller, which is a computer that runs the elevator. Instantly, the
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What is a shuffle button on an elevator?

Here is the answer directly from Otis: "The Shuffle button is used only by Otis Technicians when they need to change the placement of the lower/upper deck elevators. It allows