http://www.vintagecalculators.com/html/busicom_141-pf.html WebTheir first calculator with a microprocessor is the Busicom 141-PF. Their entry based calculators, the Busicom LE-120A (Handy-LE) and LE-120S (Handy), [7] were the first to fit in a pocket and also the first calculators to use an LED display. Microprocessor
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Busicom - Wikipedia
WebThe Busicom LC 120 is an arithmetic calculator with 12 digits precision and algebraic logic. It has 4 functions, 17 keys, and an LCD (liquid crystal) display. Facts at a glance: … WebBusicom LE-120A "HANDY" using the MK6010L version of the "Calculator-on-a-Chip" developed by Mostek. This was the world's first true pocket calculator, small enough to fit in a shirt pocket, and also the first … http://www.vintagecalculators.com/html/casio_fx-10.html crw7 ratchet