Magic Brain Calculator - How to Subtract

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Unopened package Includes instructions, Calculator and Stylus are both metal

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

Santa Cruz Biotechnology (SCBT) - 1960's Magic Brain Calculator. #SoCool #Math #Antiques

Printed Brain - Slide calculator by Ornotermes, Download free STL model

Printed Brain - Slide calculator by Ornotermes, Download free STL model

Magic Brain: Last Gasp of the Mechanical Calculator

How To Read Someone's Mind With Math (7 Awesome Math Tricks)

Calculate numbers by using the metal stylus to slide the rows. Great condition! , 5 3/4” x 3 1/4”

1960’s Chadwick Magic Brain Calculator

Vintage Metal Chadwick Magic Brain Pocket Calculator w/Stylus, Instructions &Box

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