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comp·tom·eter [ˌkɒmpˈtɒmɪtəʳ, ingl am ˌkɑ:mpˈtɑ:mɪt̬ɚ] SOST INFORM

comptometer

automatische Zählmaschine

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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

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

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