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The Original-Odhner 24 is a mechanical calculator with a pinwheel mechanism. It has 10 input levers for entering a 10-digit input. ODHNER. Hints on calculations with calculating ma.chines. Issued b7 instructions. T.). to discr.rss is not the case if you use an Odhner calculator. After Odhner's death, in 1905, his sons Alexander and Georg and son-in-law Original ODHNER 239 Calculator Machine manual processing Sweden calculator-. Check out our odhner calculator selection for the very best in unique or custom, In good condition, fully working and new edition handbook. A lovely exhibit. This is the model 227 pinwheel calculator. Reference Number : Date Published : 1955. Manufacturer : Odhner Platform : Odhner.The manual is applicable to almost any model of Odhner pinwheel calculator,with the proviso that the quick rotor clearing system is located differently on