Magic brain' calculator. C.1955 Science Museum Group Collection

Magic brain calculator in tin and plastic, with stylus and instructions

Magic brain' calculator. C.1955 Science Museum Group Collection

Chadwick Magic Brain Calculator, B1633.01

Magic-Brain Calculator (2) - Calculator - Computing History

S SpringerLink

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Magic Brain Calculator-original Pocket Math Device-1960s-made in

Magic brain' calculator. C.1955 Science Museum Group Collection

Magic Brain Calculator Vintage Calculator Plus Minus

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Magic Brain Calculator, c. 1950-1969 - Machine, Calculating