en.wikipedia.org/wiki/Calculator

The first portable calculators appeared in Japan in 1970, and ... came out in the Autumn of 1971, with four functions and an ...

www.vintagecalculators.com/html/history_of_electronic_calculat.html

The History of Pocket Electronic Calculators .... Selling for just under $400, the " Pocketronic" was a four function, hand-held, printing calculator, with the only ...

www.vintagecalculators.com/html/electronic_calculators__1965-7.html

By the dawn of the pocket electronic calculators in the early 1970's prices had fallen significantly but a simple four-function model could still set you back more ...

www.vintagecalculators.com/html/hand-held_calculators.html

Two of the first hand-held calculators, based on Texas Instruments technology. Sanyo ICC-82D 1970. Four-function, amber gas-discharge tubes. One of the first ...

www.vintagecalculators.com/html/the_pocket_calculator_race.html

The 180-mil-square [0.18 inches-square (4.6 mm-square)] chip contains the logic for a four function 12-digit calculator - more than 2,100 transistors in 360 gates ...

www.staples.com/Texas-Instruments-Basic-Calculators/cat_CL90000/0071h

Save big on our wide selection of Texas Instruments Basic Calculators and get fast ... A basic calculator, also known as a four-function calculator, allows users to ...

www.staples.com/Basic-Calculators/cat_CL90000

Select basic calculators small enough to fit into your pocket, so you can make on- the-go calculations out in the field. Many calculators operate via included AC ...

www.schoolmart.com/parcc-basic-four-function-calculators-for-grades-6-7

Grades 6-7: PARCC Compliant Four-function calculators with square root and ... If schools or districts permit students to bring their own hand-held calculators for ...