First Electronic Calculator Prototype – Joy of Museums Virtual Tours
Calculator - Wikipedia
TI Cal-Tech: World's First Pocket Electronic Calculator
Jerry Merryman, the man who helped invent the hand-held calculator, has died | CNN Business
Electronic Calculators: Desktop to Pocket - Engineering and Technology History Wiki
First handheld calculator headlines auction of mathematical treasures
The Pocket Calculator Race
The History Of The Calculator: When was the Calculator First Invented?
First Handheld Calculator - Decades TV Network - YouTube
A history in calculators
TI Cal-Tech: World's First Pocket Electronic Calculator
Why is the pocket calculator a significant invention? - Quora
Calculator - Wikipedia
How much was the first pocket calculator and what was it? - Quora
Jerry Merryman, Co-Inventor of the Pocket Calculator, Dies at 86 - The New York Times
The Pocket Calculator Race
The history of technology is the history of pockets
Handheld Electronic Calculators | Whipple Museum
The Calculators Brief History: When was the calculator invented
A history in calculators
File:Vintage Casio Pocket-Mini (aka P811) LED Handheld Electronic Calculator, Made in Japan, Circa 1976 (8714450871).jpg - Wikimedia Commons
Solar-powered calculator - Wikipedia
World's first handheld calculator up for grabs - BBC Newsround
Pocket Calculator - The Golden Age
