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The Etch-a-Sketch had Apple beat to the basic tablet design as well.
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!
Star Trek had tablets in the 60s.
Thanks to the wonders of television, we also knew in 1966 that the future belong to tablets. Here, we see Lt. Uhura of tne Enterprise using what presumably is an iPad 2255—better known to true Star Trek fans as a Personal Access Display Device (PADD).
Another Star Trek tablet from the 60s.
What's that you say? That's a fixed part of the bridge? Nope. Here's another PADD being carried about by some poor slob wearing a red-shirt and we all know what that means!