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sandipan S
sandipan S May 06, 2013
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I've seen these sensors...

Often 3
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Rarely 1
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What is it? 5
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Similar Photos: Temperature@lert’s temperature and environmental monitoring solutions provide both real-time and historic views of a location’s temperature Pedestrians to cross the road, they will touch the switch. With minutes/seconds the censors given green to the walk way and red to others. Inteligent sempahores. We have at least 2 of them being tested on traffic jam avenues. They detect cars and can change before countdown ends

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