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Pulsar P4 Time Computer with LED display ref. 3215-2 mens stainless steel watch circa 1975 Made in the USA A Pulsar LED watch from 1976. In 1970, Pulsar was a brand of the American Hamilton Watch Company which first announced that it was making and bringing the LED watch to market. It was developed jointly by American companies Hamilton and ...
The history of watches began in 16th-century Europe, where watches evolved from portable spring-driven clocks, which first appeared in the 15th century. The watch was developed by inventors and engineers from the 16th century to the mid-20th century as a mechanical device, powered by winding a mainspring which turned gears and then moved the ...
First woman to earn a Philosophy doctorate degree. [42] [43] 1732 Laura Bassi: First woman to officially teach at a European university. [44] [45] [46] 1874 Grace Annie Lockhart: First woman in the British Empire to receive a Bachelor's degree: 1875 Stefania Wolicka-Arnd: First woman to receive a PhD in the modern era. [47] [48] 1891 Juana Miranda
Bette Nesmith Graham, the founder of the Liquid Paper company, invented one of the first forms of correction fluid in 1956. [43] House solar heating Hungarian-American MIT inventor Mária Telkes and American architect Eleanor Raymond created, in 1947, the Dover Sun House, the first house powered by solar energy. Wrinkle-free fiber
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The first self-winding mechanism was invented for pocket watches in 1770 by Abraham-Louis Perrelet, [57] but the first "self-winding", or "automatic", wristwatch was the invention of a British watch repairer named John Harwood in 1923. This type of watch winds itself without requiring any special action by the wearer.
In 1969, Seiko produced the world's first quartz wristwatch, the Astron. [200] During the 1970s, the introduction of digital watches made using transistors and plastic parts enabled companies to reduce their work force. By the 1970s, many of those firms that maintained more complicated metalworking techniques had gone bankrupt.
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