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2. Travel alarm clock - Wikipedia

   en.wikipedia.org/wiki/Travel_alarm_clock

   The best-known wristband-type travel alarm clock models were Jaeger-LeCoultre's Memovox in 1950 and Pierce's Duofon in 1955. [8] While the dwellings adapted to the contemporary taste of the society, the technology remained the same for a long time. Only with electronics did the construction of travel alarm clock mechanisms change. The quartz ...

3. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   The caesium atomic clock maintained by NIST is accurate to 30 billionths of a second per year. [206] Atomic clocks have employed other elements, such as hydrogen and rubidium vapor, offering greater stability (in the case of hydrogen clocks) and smaller size, lower power consumption, and thus lower cost (in the case of rubidium clocks). [206]

4. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   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.

5. List of clock manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_clock_manufacturers

   Sir John Bennett; 65 Cheapside, London, watch, clock and jewellery manufacturer (15 October 1814- 3 July 1897), was a watchmaker and local politician. He was the eldest son of John Bennett, watchmaker, of Greenwich.

6. Seiko - Wikipedia

   en.wikipedia.org/wiki/Seiko

   Seiko Clock Inc. — Development, manufacturing and sales of clocks (desk clocks, wall clocks, alarm clocks, musical clocks) Seiko Service Center Co., Ltd. — repair and after service for watches Seiko Time Systems Inc. — Sale and incidental installation work for system clocks, varied information display equipment and sports timing equipment ...

7. 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 ...