Casio had made calculation more efficient and labor-saving, while greatly improving usability. The 14-A had just 10 number keys, just like pocket calculators today. Moreover, the calculators at that time used what was called a “full keypad,” featuring a column of keys (0 to 9) for each of the digit places. While gear-type calculators took about 10 seconds to perform multiplication and division, the 14-A took only five to six seconds, and was much quieter. The Kashio brothers also succeeded in making a calculator that was desk size - small enough to be installed in an office. With its release in 1957, the 14-A was able to perform the four basic arithmetic operations up to 14 digits using just 341 relays. Massive computers equipped with 13,000 relays were already in use. In order to overcome these issues by developing a calculator based on a completely new concept, the Kashio brothers looked at relays, a technology used by telephone exchanges at that time. Furthermore, because the gears were rotated at high speed by electric motor, there was also a noise problem. In the 1950s, gears were used in office calculators, which took about 10 seconds on average to perform multiplication or division. Equipped with relays, the 14-A was the world’s first compact all-electric calculator.
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