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Rebuilding the Original Odhner Model 127 Pinwheel Calculator

John Wolff's Web Museum Rebuilding the Original-Odhner Model 127 Pinwheel Calculator Introduction These notes give a detailed step-by-step procedure for a complete disassembly and reassembly of the Original-Odhner Model 127 mechanical calculator. The Odhner 127 is a relatively simple and straightforward machine, and is an ideal place to learn the principles on which all pinwheel calculators are based.

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