TREA

TELEPHONIC COMMUNICATION

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Industry

  • CPC
  • H04M

Parent Industries

HELECTRICITY H04Electric communication

Current Industry

H04MTELEPHONIC COMMUNICATION

Sub Industries

H04M1/00Substation equipment H04M11/00Telephonic communication systems adapted for combination with other electrical systems H04M13/00Party-line systems H04M15/00Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications H04M17/00Prepayment of wireline communication systems, wireless communication systems or telephone systems H04M19/00Current supply arrangements for telephone systems H04M2201/00Electronic components, circuits, software, systems or apparatus used in telephone systems H04M2203/00Aspects of automatic or semi-automatic exchanges H04M2207/00Type of exchange or network H04M2215/00Metering arrangements Time controlling arrangements Time indicating arrangements H04M2242/00Special services or facilities H04M2250/00Details of telephonic subscriber devices H04M3/00Automatic or semi-automatic exchanges H04M5/00Manual exchanges H04M7/00Interconnection arrangements between switching centres H04M9/00Interconnection arrangements not involving centralised switching H04M99/00Subject matter not provided for in other groups of this subclass
Industries

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Patents Applicationslast 30 patents