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Faber Castell NOVO DUPLEX 2/83 N slide rule
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Faber Castell NOVO DUPLEX 2/83 N slide rule
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This was one of the last rules produced by Faber Castell and could be considered the culmination of the development of the slide rule by one of Europe's leading manufacturers. It is a duplex rule with 30 scales.
2. On the front face t are 15 scales. 3. On the rear face t are another 15 scales. 4. Other features include: A second tan scale covering the range 41 to 85 Gauge marks providing a correction for the ST (sin/tan) scale Indication of correction to be applied to common D and LL0 scale Use of W scales which give the accuracy of 20" scales on a 10" rule Four log-log and four inverse log-log scales This slide rule is in excellent condition. No scratches or marks. It comes in the plastic case with a German instruction booklet together with the additional plastic ruler. 
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