File:Vintage Casio Pocket-Mini (aka P811) LED Handheld Electronic Calculator, Made in Japan, Circa 1976 (8714450871).jpg - Wikimedia Commons
Calculator - Wikipedia
Evolution of the Calculator 2,000 BCE - 2020 | History of Calculator, Documentary video - YouTube
TI Cal-Tech: World's First Pocket Electronic Calculator
Why is the pocket calculator a significant invention? - Quora
The History Of The Calculator: When was the Calculator First Invented?
The History Of The Calculator: When was the Calculator First Invented?
Jerry Merryman, the man who helped invent the hand-held calculator, has died | CNN Business
Jerry Merryman, Co-Inventor of the Pocket Calculator, Dies at 86 - The New York Times
The History Of The Calculator: When was the Calculator First Invented?
A history in calculators
POCKET CALCULATOR (Inventions)
Handheld Electronic Calculators | Whipple Museum
The Pocket Calculator Race
How much was the first pocket calculator and what was it? - Quora
TI Cal-Tech: World's First Pocket Electronic Calculator
Nerd Alert: 7 Iconic Calculators of Yore | PCMag
File:Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan (11591234036).jpg - Wikimedia Commons
Farewell, Pocket Calculator? - The New York Times
The History Of The Calculator
The Calculators Brief History: When was the calculator invented
First Electronic Calculator Prototype – Joy of Museums Virtual Tours
Brilliant' inventor who co-created first handheld calculator in 1967 dies | Metro News
The history of technology is the history of pockets
