Magic-Brain Calculator (2) - Calculator - Computing History

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

Be a Human Calculator: Mere Observation - No Magic: Sarswat

Powerhouse Collection - Two Magic Brain pocket calculators

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

The 'Missing Digit' Calculator Trick - magic blog

Group of Vintage Adding and Numbering Machines

File:Vintage Magic Brain Mechanical Pocket Calculator, Made in

Let us Calculate!”: Leibniz, Llull, and the Computational

Mental Calculator: 9 Steps To Becoming a “Human Calculator” Fast

Timeline of Computer History