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

William C. Sand

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Call charging arrangement

Multiplex communications – Wide area network – Packet switching
Patent

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Signaling protocol channel unit

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

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Signaling protocol interface channel unit

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
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Profile ID: LFUS-PAI-P-1575023

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