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  1. Copilot Answer
    Wikipedia
    https://en.wikipedia.org/wiki/Curta
    Curta - Wikipedia
    History

    The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria. By 1938, he had filed a key patent, covering his complemented stepped drum. This single drum replaced the multiple drums, typically around 10 … See more

    Kalkulator „Curta” – Wikipedia, wolna encyklopedia
    Wikipedii
    Cost

    The Curta Type I was sold for $125 in the later years of production, and the Type II was sold for $175. While only 3% of Curtas were returned to the factory for warranty repair, a small, but significant number of buyers retu… See more

    Design

    The Curta's design is a descendant of Gottfried Leibniz's Stepped Reckoner and Charles Thomas's Arithmometer, accumulating values on cogs, which are added or complemented by a stepped drum mechanism. … See more

    Models

    The Type I Curta has eight digits for data entry (known as "setting sliders"), a six-digit revolution counter, and an eleven-digit result counter. According to the advertising literature, it weighs only 8 ounces (230 g). Serial num… See more

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