The Casio brand is known for its quality watches. The name of the calculator was Casio 14-A. Kashio Todao established a company named Kashio Seisakujo back on 1946. The company’s first product was a ring-mounted cigarette holder, which became successful quickly. The company developed various types of calculators, including the first scientific calculator. In 1974, Casio started expanding its product line, thus manufacturing the brand’s first watches. Casio is the company that produced the first shock resistant and the first digital diary watch.