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At the company I used to work at, the boardroom there had big glass doors. On the doors was an accordian-style blackout blind that ran from the top to the bottom in some sort of a channel on each side of the window. The channels were lined with brushes. These were manual units, operated with a pull-chain, but in retrospect, it seems to mee they'd be very adaptable to being motor-driven. THese suckers were TOTALLY dark.
Sorry, I have NO idea on a source, or even a name. But the product is out there. Maybe check with a glass-shop...
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