TREA

with means for interrupting existing connections with means for breaking-in on conversations

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Industry

  • CPC
  • H04M3/20
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M3/00Automatic or semi-automatic exchanges

Current Industry

H04M3/20with means for interrupting existing connections with means for breaking-in on conversations
Industries