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traffic signal sensor
Fei C
Fei C May 09, 2013
traffic signal sensor

I've seen these sensors...

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Similar Photos: weather sensor in advance The wireless sensor network installed in a student plot at Kew Gardens. (top) A Bicing station; a close-up of a bicycle and parking slot; and a user at a station kiosk using RFID to check-out a bicycle; (bottom)

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