Casio

Casio was established in April 1946 by Tadao Kashio. His first major product was the yubiwa pipe, a finger ring that could hold a cigarette, allowing the wearer to smoke, while leaving their hands free. The invention was a success and in 1949, Kashio used the profits from the yubiwa pipe to develop electronic calculators. In 1957, Casio released the world's first all-electric compact calculator.