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traffic red light sensor on the train rail
Fei C
Fei C May 09, 2013
traffic red light sensor on the train rail

I've seen these sensors...

Often 2
Occasionally 1
Rarely 1
Never 0
What is it? 1
0 Comments     5 Tags
Similar Photos: No-Spill Mill A common use of pressure sensors in a water meter. Hi everyone.<br/>I use often this traffic counter form my job. This instrument is a radar car counter and track:class, speed and headway.

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