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  DSC02381.JPG - Original Odhner pinwheel calculator from ~1930. Model is M602n, predecessing the model 27. It still has the winged screws to reset the counters to zero (newer machines have cranks). Donated by Claude Wangen, member of the Computarium crew.  
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Original Odhner pinwheel calculator from ~1930. Model is M602n, predecessing the model 27. It still has the winged screws to reset the counters to zero (newer machines have cranks). Donated by Claude Wangen, member of the Computarium crew. Download
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