Electronic Calculators—Handheld | National Museum of
https://americanhistory.si.edu/collections/object-groups/handheld-electronic-calculators
Casio, founded in 1946, had sold electric desk calculators since the 1960s, and introduced a transistorized form of the machine in 1965. In the 1970s and 1980s, it released a variety of microprocessor-based consumer products including handheld calculators, digital watches, electronic musical instruments, and televisions.
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