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Star Trek isn't the only future with tablets. In Stanley Kubrick/s 1968 movie, 2001: A Space Odyssey, we also have tablets
Of course, long before the iPad, real world tablets were already appearing, While you certainly couldn't call it portable, the basic idea of a tablet can be seen in 1961's RAND Tablet, aka Grafacon (for 'Graphic Converter').
The first prototype, which sure enough looks like an iPad, was the brainchild of Alan Kay: the Dynabook. This appeared in 1972.