Interesting set of 2 side slide rule charts, one made by Also in Dutch and one by IWA model 5812 in German.Both made for the Carborundum Company in Germany and Holland.Both made for grinding machine calculations. They are both in very condition so there are only small signs of use or age from normal use. They are fully functioning with all parts intact. The both measure ca, 10 cm or ca. 4 inches on the small sides. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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2x Carborundum Alro IWA circular slide rule 1960 Holland Germany
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KNM duplex circular slide rule full set made ca. 1960 in Holland
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