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Automated Salt Management Spreaders to reduce salt on roads
Virginia H2
Virginia H2 May 07, 2013
Automated Salt Management Spreaders to reduce salt on roads

I've seen these sensors...

Often 1
Occasionally 0
Rarely 1
Never 9
What is it? 1
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Similar Photos: traffic red light sensor on the train rail It is a pedestrian crossing sensor. Once people touch it, this displays a red sign which tells one can cross. It is widely used in Germany. Smell sensor applied for checking meat freshness.

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