4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Line status indication or call alerting
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Dealing call terminal device

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

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Device for detecting operation state of telephone hook switch

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

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