Powerhouse Collection - Two Magic Brain pocket calculators

Mechanical addiator type calculators (2) with stylus, instruction manual and packaging, magic brain pocket calculator, metal / plastic / paper, maker unknown, Hong Kong / Japan, 1950-1960

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Powerhouse Collection

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Magic Brain: Last Gasp of the Mechanical Calculator

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Magic Brain Calculator - A vintage mechanical addiator type

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Addiators A Collection of Mechanical Calculators

Blog - DTC Computer Supplies