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www.reference.com/history/invented-first-calculator-3378af6ce6f5cebc

It was not until 1948 that a pocket-sized calculator was invented and came in the form of the Curta calculator. It was not until the 1960s and the advent of electronic devices that the electronic calculator came to be. ANITA (A New Inspiration To Arithmetic/Accounting) was the first all-electric desktop calculator and was released in 1961.

en.wikipedia.org/wiki/Calculator

The first calculator capable of symbolic computing was the HP-28C, released in 1987. It could, for example, solve quadratic equations symbolically. The first graphing calculator was the Casio fx-7000G released in 1985. The two leading manufacturers, HP and TI, released increasingly feature-laden calculators during the 1980s and 1990s.

www.thecalculatorsite.com/articles/units/history-of-the-calculator.php

The first step was seen in 1961 with the arrival of ANITA (A New Inspiration To Arithmetic/Accounting). This was the world's first all-electronic desktop calculator and it was developed in Britain by Control Systems Ltd., marketed under its Bell Punch and Sumlock brands.

www.quora.com/Who-is-the-inventor-of-the-calculator

The first solid state electronic calculator was created in the early 1960s. Pocket sized devices became available in the 1970s, especially after the first microprocessor, the intel 4004, developed by Intel for the Japanese calculator company Busicom. The original calculator was the abacus, developed in China in the 9th century.The young French mathematician Blaise Pascal (1623 - 1662) invented ...

www.thoughtco.com/history-of-calculators-1991652

Determining who invented the calculator and when the first calculator was created is not as easy as it seems. Even in pre-historic times, bones and other objects were used to calculate arithmetic functions.

www.ideafinder.com/history/inventions/handcalculator.htm

The original compact calculator was the abacus, developed in China in the ninth century. The young French mathematician Blaise Pascal (1623-1662) invented the first adding machine in 1642, a clever device driven by gears and capable of performing mechanical addition and subtraction.

en.wikipedia.org/wiki/Mechanical_calculator

Thomas' arithmometer, the first commercially successful machine, was manufactured two hundred years later in 1851; it was the first mechanical calculator strong enough and reliable enough to be used daily in an office environment. For forty years the arithmometer was the only type of mechanical calculator available for sale.

www.educalc.net/196488.page

In 1642, at the age of 18, Pascal invented and build the first digital calculator as a means of helping his father perform tedious tax accounting. Pascal’s father was the tax collector for the township of Rouen. The device was called Pascal’s calculator or the Pascaline or the Arithmetique.

www.ti.com/about-ti/company/history.html

We develop the first electronic hand-held calculator (Cal Tech) in 1967 while also focusing our efforts on developing faster, smaller and more powerful TI chips. The Apollo Lunar Exploration Module containing TI components lands on the moon during this decade.

www.vintagecalculators.com/html/calculator_time-line.html

The first calculators equipped with solar cells (used to charge the internal batteries) include the Sharp EL-8026 "Sun Man" and the Royal Solar I / Triumph-Adler 1980. 1978. First solar-powered and first credit card sized calculators. One of the first solar-powered calculators is the Teal Photon.