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

Beat Voser

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Telephone

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

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Telephone having two handsets

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Profile ID: LFUS-PAI-P-1118922

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