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this has literally been around for decades..
it was done in the 60's but never caught on .
amtrack trains were going to use it i believe
i remember seeing a video of it ages ago and thought that it would be used in tons of places today.
what is it is 2 planes of glass with some chemical in between the glass, when given a charge the chemical allows 0 light thru .. so from clear to black..
would be great in so many places.
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hatisblack at yahoo.com
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