4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Interexchange signalling

Cornelis A. M. Oerlemans

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Private automatic branch exchange (PABX) system with transparent

Telephonic communications – Plural exchange network or interconnection – Multi-pbx interconnection
Patent

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Telecommunication system for providing status information of con

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Profile ID: LFUS-PAI-P-101027

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