Casio Computer Co., Ltd. was founded in 1957 to manufacture the relay calculator developed by Kashio. Turning Kashio's idea into a commercial product required the assistance of his three brothers. The youngest brother Yukio handled manufacturing; the other younger brother Kazuo was in charge of sales; and older brother Tadao, with experience managing a lathe factory, took care of the finances and general affairs of the company.
(Photo left: Toshio Kashio)