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Video of the rotor turning in an automatic wristwatch having a glass back, when the watch is moved by hand. An automatic watch, also known as a self-winding watch or simply an automatic, is a mechanical watch where the natural motion of the wearer provides energy to wind the mainspring, making manual winding unnecessary if worn enough. [1]
A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
Citizen Watch Co., Ltd. (シチズン時計株式会社, Shichizun tokei Kabushiki-gaisha), also known as the Citizen Group, is an electronics company primarily known for its watches and is the core company of a Japanese global corporate group based in Nishitokyo, Tokyo, Japan.
John Harwood (1893–1965), English inventor and clockmaker, automatic wrist watch, Fortis watch brand. Rasmus Sørnes (1893–1967), Norwegian radio technician and clockmaker, Sola, astronomical clock. Paul Behrens (1893–1984), German clockmaker, Lübeck, astronomical clock.
Later specialized tool watch designs were introduced like the Promaster Eco-Drive Professional Diver 1000M Titanium BN7020-09E in 2017. This is a very large watch, the titanium watch case has a diameter of 52.2 mm and thickness of 22 mm and features a helium release valve, designed for mixed gas saturation diving at great depths. [6] [7] [8]
1930: Patent for a watch with window to display the date [24] 1930: Eugène Meylan's patent for automatic modules for watches (not Glycine's, but Meylan's personal patent, used in Glycine's first automatic watches) [2] [6] 1931: Patent for a fold-out lever crown to set the time [25] 1953: Patent for a 24-hour watch, used for the Airman [26]
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