TREA

comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency

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Industry

  • CPC
  • H04Q1/46
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Parent Industries

HELECTRICITY H04Electric communication H04QSELECTING H04Q1/00Details of selecting apparatus or arrangements for establishing connections among stations for the purpose of transferring information via these connections

Current Industry

H04Q1/46comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency
Industries