By A Mystery Man Writer
Vintage Chadwick Magic Brain Calculator on A La Modern
References, Page 4
Don't put too much stock into it yet, but eventually this will be
Magic Brain: Last Gasp of the Mechanical Calculator
Magic Brain Instructions
Electronic Calculators—Handheld
Victor 620 Vintage 1970s Desktop Calculator W Manual
Magic Brain Calculator, c. 1950-1969 - Machine, Calculating
Magic Brain: Last Gasp of the Mechanical Calculator
Sheet, Simplified Instructions Magic-Brain Calculator
Vintage 1960's Magic Brain Pocket Calculator W/Stylus, Made in
Electronic Calculators—Handheld