4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Detail of hold circuitry
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Digital key telephone system and extension terminal device...

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

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Diverter interface between two telecommunication lines and a sta

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

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