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  2. Clock network - Wikipedia

    en.wikipedia.org/wiki/Clock_network

    The master clock in a clock network can receive accurate time in a number of ways: through the United States GPS satellite constellation, a Network Time Protocol server, the CDMA cellular phone network, a modem connection to a time source, or by listening to radio transmissions from WWV or WWVH, or a special signal from an upstream broadcast network.

  3. GNSS applications - Wikipedia

    en.wikipedia.org/wiki/GNSS_applications

    GNSS can be used as a reference clock for time code generators or Network Time Protocol (NTP) time servers. Sensors (for seismology or other monitoring application) can use GNSS as a precise time source. Time-division multiple access (TDMA) communications networks often rely on this precise timing to synchronize RF generating equipment, network ...

  4. Fingerprint scanner - Wikipedia

    en.wikipedia.org/wiki/Fingerprint_scanner

    There are four types of fingerprint scanners: [7] optical scanners, capacitance scanners, ultrasonic scanners, and thermal scanners. The basic function of every type of scanner is to obtain an image of a person's fingerprint and find a match for it in its database. The measure of the fingerprint image quality is in dots per inch (DPI). [8]

  5. SimplexGrinnell - Wikipedia

    en.wikipedia.org/wiki/SimplexGrinnell

    Meanwhile, Edward G. Watkins founded the Simplex Time Recorder Company in 1894. Watkins invented and patented one of the first practical time clocks, along with the synchronized clock systems seen in schools up until recent times. The company, located in Gardner, Massachusetts, purchased the IBM Time Equipment Division in 1958. [7]

  6. Indoor positioning system - Wikipedia

    en.wikipedia.org/wiki/Indoor_positioning_system

    An indoor positioning system (IPS) is a network of devices used to locate people or objects where GPS and other satellite technologies lack precision or fail entirely, such as inside multistory buildings, airports, alleys, parking garages, and underground locations.

  7. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    Electronic 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

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