A set of stairs that moves by electric power and

 on which people can stand to be taken up and down from one level to another, usually within a building.

The elevator car is constructed with a steel framework that gives it durability and strength.

A cross head is positioned over the top of the car, made up of a set of steel beams.

These span the elevator shaft from side to side and hold the pulley system for the hoist cable.



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