4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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Balanced network for use in a keyphone system

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

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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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Busy line display method

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Reexamination Certificate

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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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