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Quartz movement of the Seiko Astron, 1969. The quartz crisis (Swiss) or quartz revolution (America, Japan and other countries) was the advancement in the watchmaking industry caused by the advent of quartz watches in the 1970s and early 1980s, that largely replaced mechanical watches around the world.
Disassembled analog quartz clockwork; quartz crystal oscillator (top left), Lavet-type stepping motor (left) with a black rotor sprocket and connected white and transparent gears (right).
Japanese company Seiko pioneered the technique which it unveiled at the Baselworld 1986 trade show under the trial name AGM. [2] The first such watch was released in Germany in January 1988 and April of the same year in Japan (under the name Auto-Quartz). [3]
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
Movimiento Victoria Ciudadana (English: Citizens' Victory Movement, generally abbreviated as MVC) is a Puerto Rican political party founded in 2019. It ran in the 2020 general elections on an anti-colonial platform, proposing a constitutional assembly to determine a final decision regarding the relationship between the United States and Puerto Rico.
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide).The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2.
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