H ELECTRICITY
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H04 ELECTRIC COMMUNICATION TECHNIQUE
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H04J MULTIPLEX COMMUNICATION
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3/00 Time-division multiplex systems
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H04J3/02 Details
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H04J3/06 Synchronising arrangements
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H04J3/0635 Clock or time synchronisation in a network
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H04J3/0638 Clock or time synchronisation among nodes; Internode synchronisation
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H04J3/0641 Change of the master or reference, e.g. take-over or failure of the master
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