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Huawei tri-fold review
(www.gizmochina.com)
This is a most excellent place for technology news and articles.
It's not the idea that's innovation, it's developing the technology that folds both ways seamlessly and is durable.
Just because an idea is easy to get, doesn't mean it's easy to make. Ideas are easy, it's making them work that is hard.
And I'm not aware of a phone that existed previously that could do this and fold out to a single 10 inch screen.
Even if it already existed, this is apparently the first good one.