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The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in June 1989 [1] as a successor of the F-87W, [2] it is popular for its low price, long battery life and iconic design. [3] As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. [4]
Original Timex Triathlon Watch from 1984, precursor to the Ironman series of watches 1st Generation Timex Ironman Watch - Released in 1986. In 1984, Timex worked together with the officials of the Ironman Triathlon sporting event to develop a new digital watch focused on the needs of triathletes. The result was the Timex Triathlon.
It specialized in LED-powered, five-function (hour, minutes, second, day and date) digital watches. The Armitron brand name is a combination of “Armin” and “electronics”. Often using cases from Switzerland and bracelets from Hong Kong, Armitron watches were built in a custom-designed factory in Arlington, Texas.
In watches sold for timekeeping, analog display remains very popular, as many people find it easier to read than digital display; but in timekeeping watches the emphasis is on clarity and accurate reading of the time under all conditions (clearly marked digits, easily visible hands, large watch faces, etc.).
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The watch had a small lens at the top of its face used for data transmission by visible light. [5] [21] Data was transmitted from the CRT of the computer through a series of pulsating horizontal bars, [22] [23] that were focused by the lens and written to the watch EEPROM memory through an optoelectronic transducer operating in the visible light spectrum and employing optical scanning technology.