The first European-made pocket-sized calculator, DB 800 was made in May 1971 by Digitron in Buje, Croatia (former Yugoslavia) with four functions and an eight-digit display. Pocket-sized devices became available in the 1970s, especially after the Intel 4004, the first microprocessor, was developed by Intel for the Japanese calculator company Busicom. It weighed 1.59 pounds (721 grams), had a vacuum fluorescent display, rechargeable NiCad batteries, and initially sold for US$395. January 1971 the Sharp EL-8, which was close to being a pocket calculator. These included the Sanyo ICC-0081 "Mini Calculator", the Canon Pocketronic, and the Sharp QT-8B "micro Compet". ![]() The first commercially produced portable calculators appeared in Japan in 1970, and were soon marketed around the world. ![]() As a result of the "Cal-Tech" project, Texas Instruments was granted master patents on portable calculators. It could add, multiply, subtract, and divide, and its output device was a paper tape. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. ![]() The first solid-state electronic calculator was created in the early 1960s. It all changed with the invention of a hand help pocket calculator. Ofcourse, it still required a lot of calculations to be done by pencil and paper, so people who had good memorization of math multiplication tables did better! Growing up in 1960’s and 70’s, engineering students best friend was a slide rule.
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