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    Black Framed Canvas

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    Logarithmic slide rule This adjustable ruler contains the values for logs which are used to aid multiplication and division Logarithms are mathematical functions relating numbers to the powers of a set base number such as ten Sliderules have been superseded by the use of electronic calculators

    Logarithmic Slide Rule-Friedrich Saurer-Framed Stretched Canvas

    Work by Friedrich Saurer

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