The Kashio brothers (Tadao, Yukio, Toshio, and Kazuo) found Casio Computer Co. and present in 1957 the 14-A model, the first electromagnetic-relay electric calculator with a ten-key numeric keyboard and full result display. Unlike all earlier calculators in the chain, the 14-A requires no manual force: it is fully electric. In 1965 Casio launches the 001 model, the first fully electronic desktop calculator with integrated circuits. The pocket-calculator milestone arrives in 1972 with the Casio Mini (CM-605), which popularizes personal electronic calculation at an affordable price. This Japanese link closes out a three-millennia journey: from the Sumerian stone to the silicon chip.