Launched in 1957, Casio's 14-A calculator was a revolutionary new device using 342 electric relays that solved addition, subtraction, multiplication, and division problems up to 14 digits. In September 1965, Casio released the 001, the world's first electronic calculator with a memory function. The following year, Casio commenced exports to the United States and Europe, taking its first step as a manufacturer for the global market. Casio calculators were well received around the world, and total production reached the 100,000 mark by 1969.
Citizen have an extremly wide and diversified range from compact pocket devices to highly sophisticated calculator models.
Sharp has a history of innovation, superior engineering, advanced functions and technologies Since introducing the first electronic desktop calculator in 1964, Sharp has led the way in calculator technology.