File:Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan (11591234036).jpg - Wikimedia Commons

Magic Brain Calculator - How to Add

National Museum of American History

Magic Brain Calculator - How to Add

Category:Mechanical calculators - Wikimedia Commons

Magic Brain: Last Gasp of the Mechanical Calculator

Category:Calculator collection by Joe Haupt (from Flickr stream

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

Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan

Vintage Chadwick Magic Brain Calculator. Made in Japan Mid century