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Talking Recordable Envelopes
sandipan S
sandipan S May 06, 2013
Talking Recordable Envelopes

I've seen these sensors...

Often 0
Occasionally 3
Rarely 2
Never 5
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Similar Photos: auto paper machine sensor Sensors were installed on escalators bus station from Brasilia to help save energy. They work according to the amount of people. Thus, in pe Motion activated landscape lights. Saves electricity for when it's needed.

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