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  2. Kronos Incorporated - Wikipedia

    en.wikipedia.org/wiki/Kronos_Incorporated

    In 1979, Kronos delivered the world's first microprocessor-based time clock and, in 1985, delivered its first PC-based time and attendance product. In 1992, Kronos became a publicly-traded company on NASDAQ. Aron Ain, [6] succeeded his brother Mark Ain as chief executive officer in 2005. [7] In March 2007, Kronos went private again, bought out ...

  3. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    Time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock.

  4. Antikythera mechanism - Wikipedia

    en.wikipedia.org/wiki/Antikythera_mechanism

    The Antikythera mechanism (/ ˌæntɪkɪˈθɪərə / AN-tik-ih-THEER-ə, US also / ˌæntaɪkɪˈ -/ AN-ty-kih-) [1][2] is an Ancient Greek hand-powered orrery (model of the Solar System). It is the oldest known example of an analogue computer [3][4][5] used to predict astronomical positions and eclipses decades in advance. [6][7][8] It could ...

  5. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...

  6. Holdover in synchronization applications - Wikipedia

    en.wikipedia.org/wiki/Holdover_in...

    Defining holdover. In Synchronization in telecommunications applications holdover is defined by ETSI as: An operating condition of a clock which has lost its controlling input and is using stored data, acquired while in locked operation, to control its output. The stored data are used to control phase and frequency variations, allowing the ...

  7. Calculagraph - Wikipedia

    en.wikipedia.org/wiki/Calculagraph

    A museum exhibit of Calculagraphs. The Calculagraph is a device which mechanically calculates and prints the elapsed time between two events. Their best known, earliest use was as a means of tracking of table usage in pool halls. Later, until the advent of the digital era, they became the standard way to clock the duration of toll telephone calls.

  8. The Time Monster - Wikipedia

    en.wikipedia.org/wiki/The_Time_Monster

    The Time Monster is the fifth and final serial of the ninth season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 20 May to 24 June 1972. The serial is set in a village near Cambridge as well as the mythical city of Atlantis. In the serial, the alien time traveller the ...

  9. Crystal oscillator frequencies - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator_frequencies

    Real-time clock. 0.077500 Real-time clock, quartz watches and clocks; also the DCF77 frequency 0.100000 10 5 allows decade division to 1 Hz and 1 kHz. Real-time clock, quartz watches and clocks, DMM dual slope ADCs (suppresses 50 Hz noise) 0.120000 DMM dual slope ADCs (suppresses 60 Hz noise) 0.131072 2 17 allows binary division to 1 Hz and 32. ...

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