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Roman Wax Tablet: In fact, those darn Romans back before the common era were already using tablets! Look, you can even see that they already had a frame around the display service!
Moving a few thousand years ahead, consider if you will, the Etch-a-Sketch: It's state-of-the-art toy technology for 1960. Sure, it has two knobs on the front, but darn, it's clearly a tablet!
Thanks to the wonders of television, we also knew in 1966 that the future belong to tablets. Here, we see Lt. Uhura of Star Fleet using what presumably is an iPad 2255—better known to true Star Trek fans as a Personal Access Display Device (PADD).