4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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Versatile communication device with a facsimile function and...

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

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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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