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  2. Time Clock Wizard - Wikipedia

    en.wikipedia.org/wiki/Time_Clock_Wizard

    The company was founded as a single-product company by the CEO, Sean Wolf, in February 2014. [1] [7]Time Clock Wizard is a freemium software, which includes a mobile app, [8] [9] [10] that allows unlimited users and employees to work in a single schedule, whereas, optional services such as web design, merchant accounts and other business loans credit to the company's business model.

  3. 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 ...

  4. 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 ...

  5. Sleep Calculator: How Much Sleep Do You Need? - Healthline

    www.healthline.com/health/sleep/sleep-calculator

    Sleep guidelines by age. Birth to 3 months: 14 to 17 hours. 4 to 11 months: 12 to 16 hours. 1 to 2 years: 11 to 14 hours. 3 to 5 years: 10 to 13 hours. 6 to 12 years: 9 to 12 hours. 13 to 18 years ...

  6. Calculagraph - Wikipedia

    en.wikipedia.org/wiki/Calculagraph

    Calculagraph. 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.

  7. Ovulation Calculator & Calendar - Determine Your Most Fertile ...

    www.webmd.com/baby/healthtool-ovulation-calculator

    Your menstrual cycle can vary from month to month, and not everyone's is the same length. Use this calculator to see when you may be ovulating to find your most fertile days. Typically, you can ...

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