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

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

Magic Brain Calculator - A vintage mechanical addiator type calculator, 1950-60s - Aluminium, Plastic, original packaging - Catawiki

Slide calculator - Wikipedia

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 1960s MAGIC BRAIN Pocket Mechanical Addiator Calculator Unpunched NOS

USA

Pocket Calculator.

Vintage 1960's Magic Brain Pocket Calculator Brand New Sealed Package

Powerhouse Collection - Two Magic Brain pocket calculators

Progress is fine, but it's gone on for too long.: The Magic Brain Calculator

Vintage Chadwick Magic Brain Calculator on A La Modern

Found a non-electronic calculator - 9GAG

Vintage Chadwick Magic Brain Calculator