In 1956, they were close to completing a calculator with a continuing multiplication function, and all they had left to do was figure out how to mass-produce it. They advanced the development by dividing up the work-Toshio came up with the ideas, Yukio, who had taken mechanical engineering at university, drew the plans, and Tadao and Kazuo did the production. Around that time, the two younger brothers, Kazuo and Yukio, also joined Kashio Seisakujo. It was back to the drawing board, in search of a new prototype. However, when the two brothers showed it to a trading company that imported calculators, the representative told them that their calculator was out of date because it could not do continuing multiplication (multiplying two numbers and then multiplying the result by another number and so on). Through a process of repeated trial and error, Toshio eventually produced Japan's first electric calculator in 1954. Using a type of electromagnet called a solenoid, he began developing an electric calculator without gears. Toshio thought that he could resolve this problem by using electrical circuits. ![]() The gears in these calculators were turned using an electric motor, and although they were faster than the hand-operated calculators commonly used in Japan at the time, they were much slower than calculators today and produced a shrill noise. ![]() ![]() While looking for a new product idea to follow the yubiwa pipe, the Kashio brothers laid eyes on foreign-made electric calculators at the first Business Show held in Ginza, Tokyo, in 1949.
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