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Sensors were installed on escalators bus station from Brasilia to help save energy. They work according to the amount of people. Thus, in pe
Pedro V
Pedro V May 08, 2013
Sensors were installed on escalators bus station from Brasilia to help save energy. They work according to the amount of people. Thus, in pe

I've seen these sensors...

Often 3
Occasionally 1
Rarely 1
Never 5
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