Keuffel & Esser prototype slide rule, based on Cox Duplex Rule of 1891 - MIT Slide Rule Collection - DSC03606

Keuffel & Esser prototype slide rule, based on Cox Duplex Rule of 1891 - MIT Slide Rule Collection - DSC03606

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Author: DaderotSource: commons.wikimedia.org

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self-published workcc-zerofiles uploaded by daderotkeuffel and essermit slide rule collection

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