4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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Highway expansion apparatus for key telephone system and...

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

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Hold detecting and control circuit for a key telephone system

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

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Hold-off alert system

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

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