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1989's GRIDPad was the first commercial tablet.
What's that? These are all just concepts or fiction? What do you think design is? Apple isn't fighting Samsung on patents, they're saying Samsung duplicated their look. Clearly, the tablet look has been around for thousands of years. But, if it's real equipment you want, real hardware we've got. The first tablet that shipped commercially, as far as I can tell, was the GRIDPad in 1989.