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Sensor in London's underground: a way to know if something is wrong within the network and a way to let people know when the tube is coming
Joney R
Joney R May 06, 2013
Sensor in London's underground: a way to know if something is wrong within the network and a way to let people know when the tube is coming

I've seen these sensors...

Often 3
Occasionally 3
Rarely 4
Never 2
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