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sensor for the traffic light
Fei C
Fei C May 09, 2013
sensor for the traffic light

I've seen these sensors...

Often 2
Occasionally 1
Rarely 0
Never 0
What is it? 0
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Similar Photos: this is used by us in work frequently. very useful. measures distance accurately. This is safety gate at the platform of Tokyo Metro (main subway in Tokyo).<br/>This gate opens automatically when the train comes. Tsunami warning system<br/>

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