TREA

Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set

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Industry

  • CPC
  • H04M9/003
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M9/00Interconnection arrangements not involving centralised switching

Current Industry

H04M9/003Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set
Industries