Traduzioni di „comptometer“ nel dizionario inglese » arabo

comptometer SOST

comptometer

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inglese

The comptometer, introduced in 1887, was the first machine to use a keyboard which consisted of columns of nine keys (from 1 to 9) for each digit.

en.wikipedia.org

Earlier key driven adding machines, like the comptometer, featured eight or more columns of nine keys, which made them cumbersome and costly and their operators prone to mistakes.

en.wikipedia.org