4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With intercom system
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Key telephone apparatus

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Key telephone system with distributed control

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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