Standard time and frequency signal service
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The Standard time and frequency signal service (STFS) is a service available in the United States which provides standard time and frequency signals, broadcast on very precise carrier frequencies by the U.S. Naval Observatory and the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS).

The original article can be found at: http://en.wikipedia.org/wiki/Standard_time_and_frequency_signal_service.
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