4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Line status indication or call alerting
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Trunk circuit with loop length gain equalization

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Voltage-sensitive telephone line monitor

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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