TREA

Operator's time recording or indicating arrangements

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Industry

  • CPC
  • H04M15/20
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M15/00Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications

Current Industry

H04M15/20Operator's time recording or indicating arrangements
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