The Calculators Brief History: When was the calculator invented
The History Of The Calculator
The World's First Handheld Calculator Is Up for Auction
HP 35: The First Handheld Scientific Calculator - HP History
World's first handheld calculator up for grabs - BBC Newsround
Electronic Calculators—Handheld | National Museum of American History
Handheld Electronic Calculator Prototype - Texas Instruments Cal Tech | National Museum of American History
A Brief History of Calculators in the Classroom
World's First LCD Calculator <EL-805> | Sharp Corporation | Sharp Global
World's first pocket calculator goes up for auction: 'Exceptionally rare' 17th century machine made of wood could fetch £100,000 | Daily Mail Online
Evolution of the Calculator 2,000 BCE - 2020 | History of Calculator, Documentary video - YouTube
Mechanical Calculators - History-Computer
Texas Instruments
Handheld Electronic Calculator Prototype - Texas Instruments Cal Tech | National Museum of American History
Timeline
A Brief History of the Calculator I Oxford Open Learning
The History Of The Calculator: When was the Calculator First Invented?
First Electronic Calculator Prototype – Joy of Museums Virtual Tours
File:Sharp EL-8 The First Portable Electronic Calculator.jpg - Wikimedia Commons
Calculator - Wikipedia
TI Cal-Tech: World's First Pocket Electronic Calculator
A history in calculators
HNF - Desk and pocket calculators – Electronic mass products
