Magic Brain Calculator, #772169

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

Magic Brain Calculator with instructions. 1960's.

National Museum of American History

Magic Brain Calculator - How to Divide

The Magic Brain Calculator – I Remember JFK: A Baby Boomer's

Unopened package Includes instructions, Calculator and Stylus are both metal

Vintage 1960's Magic Brain Pocket Calculator W/Stylus, Made in Hong Kong

Magic Brain Calculator - How to Multiply

Magic-Brain Calculator Smithsonian Institution

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

Magic-Brain Calculator

Magic Brain Calculator - A vintage mechanical addiator type