TREA

Arrangements for signalling the class or number of called or calling line from one exchange to another

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Industry

  • CPC
  • H04M5/18
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M5/00Manual exchanges

Current Industry

H04M5/18Arrangements for signalling the class or number of called or calling line from one exchange to another
Industries