The incomplete history of Duo devices

Apple announced the company's first device with a folding screen today, the iPhone Duo, but that's where the firsts end. The Duo is not only far from the first foldable on the market thanks to the efforts of Samsung and Google, but it's also not the first product to be called the Duo.

Former Apple CEO Steve Jobs popularized the saying "good artists copy, great artists steal," but will the iPhone Duo's folding screen, which features a custom nano-texture display material to help minimize the visibility of its crease, be enough to make us forget these other Duos that have come before it?