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using 3d guide in museum
Maryam P
Maryam P May 08, 2013
using 3d guide in museum

I've seen these sensors...

Often 0
Occasionally 0
Rarely 2
Never 5
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Similar Photos: highlight part of traffic light Popular Science article showing sensors helping to keep track of firefighters. Sensors for traffic conditions, highway and lane closures to send to people about their daily commutes.  I see them used for tracking speed.

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