4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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Radio communication system having a base unit control for establ

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

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Resetting circuit in a key-telephone system

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

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Ringing phone line selector/VOIP switch

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

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