4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Detail of hold circuitry
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Communication apparatus having a communication hold function

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Communication console station with priority queuing

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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