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en.wikipedia.org/wiki/Calculator

Although these early hand-held calculators were very costly, these advances in electronics, together with developments in display technology (such as the vacuum fluorescent display, LED, and LCD), led within a few years to the cheap pocket calculator available to all. In 1971 Pico Electronics.

americanhistory.si.edu/collections/object-groups/handheld-electronic-calculators

In the course of the 1970s, handheld electronic calculators transformed the way tens of millions of people did arithmetic. Engineers abandoned slide rules, business people gave up desktop calculating machines, and shoppers replaced simple adding machines and adders. Educators asked how much students ...

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

The Curta calculator, which first appeared in 1948, was perhaps the ultimate expression of the mechanical calculator, so compact that it could, somewhat lumpily, fit into a pocket and was capable of addition, subtraction, multiplication and division.

www.jstor.org/stable/2974875

The History of the Hand-Held Electronic Calculator Created Date: 20160811051840Z ...

edtechmagazine.com/.../2012/11/calculating-firsts-visual-history-calculators

A Brief History: The Busicom LE-120A, known as the HANDY, is the first handheld calculator to use a “calculator on a chip” integrated circuit. According to the Vintage Calculators Web Museum, the calculator featured a 12-digit display in red LED and cost $395 when it first went on sale in January 1971. Because the calculator was so ...

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

Read more about the history of calculators. ... followed by electrical calculators and then their evolution into the familiar but not-so-ubiquitous-anymore handheld calculator. Here, then, are some of the milestones and prominent figures who played a role in the development of the calculator through history.

en.wikipedia.org/wiki/HP_calculators

HP calculators are various calculators manufactured by the Hewlett-Packard company over the years.. Their desktop models included the HP 9800 series, while their handheld models started with the HP-35.Their focus has been on high-end scientific, engineering and complex financial uses.

www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0023

The Hewlett-Packard-35 Scientific Calculator was the world's first handheld scientific calculator and Hewlett-Packard's first product that contained both integrated circuits and LEDs. Take a virtual tour of this product, see close-up images and read about its history.

hackeducation.com/2015/03/12/calculators

In the early 1970s, calculators could cost several hundred dollars, but by the end of the decade, the price had come down to make them much more affordable and much more commonplace. Calculators (Not) Allowed. Calculators had already become important business tools, well before the handheld calculator.

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

History of innovation. Over the last 85 years, we have re-engineered ourselves many times. Although today we are a global technology company, our spirit of innovation has been at the heart of who we are for decades, dating back to our founders and their vision for TI at its inception in 1930.