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2. Junghans - Wikipedia

   en.wikipedia.org/wiki/Junghans

   In the late 1980s, Junghans introduced the first radio-controlled table clock on the world market. In 1990 the first radio-controlled wristwatch, called the MEGA 1, followed, designed by Hartmut Esslinger and his firm Frog Design. In 1995 Junghans presented a solar-powered watch with ceramic housing.

3. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_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. Such a clock may be synchronized to the time ...

4. WWVB - Wikipedia

   en.wikipedia.org/wiki/WWVB

   WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). [1] Most radio-controlled clocks in North America [2] use WWVB's transmissions to set the correct time. The normal signal transmitted from WWVB is 70 kW ERP and uses a 60 kHz carrier wave yielding a ...

5. History of watches - Wikipedia

   en.wikipedia.org/wiki/History_of_watches

   Junghans Mega is the world's first radio-controlled analog wristwatch in 1991. In 1990, Junghans offered the first radio-controlled wristwatch, the MEGA 1. [48] In this type, the watch's quartz oscillator is set to the correct time daily by coded radio time signals broadcast by government-operated time stations such as JJY , MSF , RBU , DCF77 ...

6. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   Standard-quality 32 768 Hz resonators of this type are warranted to have a long-term accuracy of about six parts per million (0.0006%) at 31 °C (87.8 °F): that is, a typical quartz clock or wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 to 35 °C or 41 to 95 °F) or less than a half second clock ...

7. List of clock manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_clock_manufacturers

   Gustav Becker Clock Company; Freiburg in Schlesien, Silesia (1850–1938) Florn. Thomas Haller (Thomas Haller AG), Schwenningen (1880-1900) then merged with Junghans. Thomas Ernst Haller (Haller AG), Schwenningen (1902-1928) then merged with Kienzle. Haller Uhrenfabrik GmbH, Simonswald (1874–present) Hamburg-Amerikanische Uhrenfabrik ...