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1996 — Toshiba Libretto
Japanese tech giants were often the first to produce highly miniaturized mobile devices, and Toshiba pushed the limits with the Libretto. First introduced in Japan, the Libretto was roughly the size of a VHS cassette (if you remember those), yet packed a full Windows PC in the tiny package.
It used thumb controls on the side of the small screen in place of a mouse and buttons. The tiny keyboard was not conducive to touch-typing, but owners didn't seem to mind as the Libretto sold like hotcakes in Japan.
Toshiba continued to make Libretto models for years, and eventually brought them to sell in the US. The last model was a strange beast introduced in 2010, with two touchscreens arranged in a book format instead of a keyboard.