This Norma Merkuria 190 was the “Commercial” slide rule for the businessman or trader (Kaufmann). The slide rule is a complete set with booklet in German and an extra chart in the original sleeve . Everything is fully functioning and in great condition. The diameter of the slide rule is 19 cm or 7 3/4 inches. Check the attached video on how to work your vintage man tool: circular slide rule operation instructions!
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Norma Merkuria 190 circular slide rule case Norma 1970 Germany
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rare early Rieger Merkuria 190 (before Norma Merkuria) circular slide rule with booklet in case made 1956 in Germany
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