4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Switching or supervision feature
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Data transmission system of key telephone system

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

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Data transmission system of key telephone system

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

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Dealing communication system

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

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Digital key telephone system and extension terminal device...

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

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Dual line adapter for telephone answering machine

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

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