TREA

by voice-frequency signals by pilot signals

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Industry

  • CPC
  • H04B1/46
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Parent Industries

HELECTRICITY H04Electric communication H04BTRANSMISSION H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00 Details of transmission systems not characterised by the medium used for transmission

Current Industry

H04B1/46by voice-frequency signals by pilot signals
Industries