4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Switching or supervision feature
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Speakerphone sensing circuit

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Switching arrangement for activating electrical devices

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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