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Early Michaelis concrete Eisenbeton slide rule 1910 Germany
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Early Michaelis concrete Eisenbeton slide rule 1910 Germany
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Description
This smaller wooden based slide rule is an early model (ca. 1910) by Michaelis from Germany. It is double sided and shows various calculation for Eisenbeton which translates to reinforced concrete. It has some signs of age (oxidation on screws) and use (point of the cursors are missing a small piece and some wear around the screw from friction. It works fine. It measures ca 20 cm or 8 inches wide. Check the video on how to work your vintage man tool : slide rule operation instructions!
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