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  2. Sony Dream Machine - Wikipedia

    en.wikipedia.org/wiki/Sony_Dream_Machine

    For a short time in the late 2000's, the radio clock market experienced a resurgence, because of several new ones including iPod / iPhone 30 pin docks and CD players. By the early 2010's, Sony stopped manufacturing new clocks under the "Dream Machine" name. At the time of discontinuation, the name was used for over forty years.

  3. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    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.

  4. Flip clock - Wikipedia

    en.wikipedia.org/wiki/Flip_clock

    Flip clock. A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology - the study and measurement of time and palette - and the ...

  5. TR-55 - Wikipedia

    en.wikipedia.org/wiki/TR-55

    When the TR-55 was released in Japan in August 1955, it was the first transistor radio marketed in that country. The TR-55 featured the Sony name, but the company did not officially change its name to Sony until January 1958. [3] In the autumn of 1955, Morita met with a representative of the Bulova watch company in New York City. Bulova agreed ...

  6. Time signal - Wikipedia

    en.wikipedia.org/wiki/Time_signal

    A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks; however, audible signals (even signal guns) have limited range. Busy seaports used a visual signal, the dropping of ...

  7. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...

  8. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The equation of time was engraved on sundials so that clocks could be set using the Sun. In 1720, Joseph Williamson claimed to have invented a clock that showed solar time, fitted with a cam and differential gearing, so that the clock indicated true solar time. [137] [138] [139]

  9. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    A radio clock is a clock that automatically synchronizes itself by means of radio time signals received by a radio receiver. Some manufacturers may label radio clocks as atomic clocks, [208] because the radio signals they receive originate from atomic clocks. Normal low-cost consumer-grade receivers that rely on the amplitude-modulated time ...

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