![]() CLASSWIZ (High-resolution Natural Textbook Display).fx-FD10 Pro (2014) (Surveying calculator for civil engineering).Figures in parentheses show approximate year of introduction. ![]() ![]() Note: This is a list of selected calculators. Another distinguishing innovation was the use of a single display window instead of the three display windows (one for each argument and one for the answer) used in other calculators. One of the central and more important innovations of the calculator was its adoption of the 10-key number pad at that time other calculators were using a 'full keypad', which meant that each place in the number (1s, 10s, 100s, etc. The desk-sized calculator was finished in 1954 and was Japan's first electro-mechanical calculator. Toshio possessed some knowledge of electronics, and set out to make a calculator using solenoids. Most of the calculators at that time worked using gears and could be operated by hand using a crank or using a motor (see adding machine). After seeing the electric calculators at the first Business Show in Ginza, Tokyo in 1949, Kashio and his younger brothers (Toshio, Kazuo and Yukio) used their profits from the yubiwa pipe to develop their own calculators. ![]()
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