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Large eInk is ideal for a market as large as textbooks and much more lucrative.
Architectural blueprints.
Thirty six by thirty six inch eInk could be very profitable if the durability was there and if the price could be held down to maybe seven or eight thousand dollars. Changes to the blueprints made during construction could be updated to every copy needed in real time, while maintaining an accurate record of who authorized each change and when each change was made.
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