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And, we can see tablets were still being used in the Star Trek universe in the 1990s with Deep Space Nine.
I will give Apple some credit for fictional tablets as well though. It sure seems to me that in Pixar's 2004 animated movie The Incredibles that they were already iPads. The iPhone was still three years in the future. The iPad farther still. The bottom line though is that, as anyone can plainly see, there was nothing new or worthy of protection in the basic design of an iPad.
Star Trek isn't the only future with tablets. In Stanley Kubrick/s 1968 movie, 2001: A Space Odyssey, we also have tablets