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American Printing House for the Blind - From the APH Museum Collection: Original-Odhner Model 229 calculator with braille readout: The Odhner Arithmometer was a mechanical calculator invented in Russia in 1873 by
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John Wolff's Web Museum - Original-Odhner
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Odhner Pinwheel Calculator
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Original-Odhner | A Collection of Mechanical Calculators
