A calculator from 1955: Chadwick Magic Brain Calculator
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Vintage Chadwick Magic Brain Calculator
Chadwick MAGIC BRAIN CALCULATOR, Stylist + Instructions, Made in JAPAN, NEW
Baby Calculator Company, est. 1923 - Made-in-Chicago Museum
Magic Brain Calculator, c. 1950-1969 - Machine, Calculating
Magic Brain Calculator (+) (-) (x) (1955) - Chadwick - LastDodo
History of Information
The History Of The Calculator. – G-News
PDF) Bell Pre-Computer Artifact and Book Collection Catalog
Magic brain' calculator. C.1955 Science Museum Group Collection
Magic-Brain Calculator Smithsonian Institution