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HGB
  Since 1966, the HBG longwave transmitter in Prangins Switzerland has diffused at 75 kHz the official time signals synchronised to UTC (Universal Time Coordinated).
In addition to second pulses, coded information giving the time of day and the date are also sent. The precise carrier frequency of 75 kHz, synchronised by an atomic
clock, and the time markers, can be used for the verification of frequency standards and time control purposes.