4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With special service
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Break-in method in a key system

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

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Button telephone equipment for display of calling public line nu

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

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