The MagicBrain Calculator was manufactured in 1955 by the Chadwick Company, this early calculator was operated using a stylus, and could perform addition, subtraction and multiplication calculation
Magic-Brain Calculator - Calculator - Computing History
National Museum of American History
My personal history with calculators
The History Of The Calculator: When was the Calculator First Invented?
Magic Brain: Last Gasp of the Mechanical Calculator
Vintage Chadwick Magic Brain Calculator. Made in Japan Mid century modern.
Magic Brain Calculator with instructions. 1960's.
Magic Brain Calculator Instructions - Manual - Computing History
Our Brains are Like Software, Not Hardware