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Old-fashioned slide rule on a red background

PD12M

Old-fashioned slide rule on a red background

The image shows an old-fashioned slide rule on a red background.

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The image shows an old-fashioned slide rule on a red background. The slide rule is made of metal and has a cylindrical shape with a handle on one side and a ruler on the other. The ruler is used to measure the angle of a slide, allowing for precise measurements. The red background provides a stark contrast to the metal of the slide rule, making it stand out.

Credit: National Museum of American History
License: https://creativecommons.org/publicdomain/zero/1.0/

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