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2. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   The development of atomic clocks has led to many scientific and technological advances such as precise global and regional navigation satellite systems, and applications in the Internet, which depend critically on frequency and time standards. Atomic clocks are installed at sites of time signal radio transmitters. [113]

3. The Best Alarm Clocks That’ll Wake up the Deepest of Sleepers

   www.aol.com/best-alarm-clocks-ll-wake-185900332.html

   Glowing customer review: “As a deep sleeper, I've struggled to find an alarm clock loud enough to wake me up, but this one does the job perfectly. The twin-bell design is incredibly effective ...

4. 7 Best Alarm Clocks for Heavy Sleepers, According to a ... - AOL

   www.aol.com/lifestyle/7-best-alarm-clocks-heavy...

   Shop the best loud alarm clocks for heavy sleepers on Amazon and more that are recommended by our editor, who tested several of them, and a sleep psychologist.

5. Atmos clock - Wikipedia

   en.wikipedia.org/wiki/Atmos_clock

   The first clock powered by changes in atmospheric pressure and temperature was invented by Cornelis Drebbel in the early 17th century. Drebbel built as many as 18 of these, the two most notable being for King James VI & I of Britain, and Rudolf II of Bohemia. The King James clock was known as the Eltham Perpetuum, and was famous throughout Europe.

6. Start Your Day Screen-Free with One of the Best Alarm Clocks ...

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   Best Overall: Jall Wooden Alarm Clock. Best Analog Option: Peakeep Analog Alarm Clock. Most Compact: Lexon Flip + Best Modern Design: Newgate Centre of the Earth Alarm Clock. Best Gentle Wake-up ...

7. 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.