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

Hitachi Communications Systems, Inc.

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Cell/packet assembly and disassembly apparatus and network syste

Multiplex communications – Communication techniques for information carried in plural... – Assembly or disassembly of messages having address headers
Patent

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High frequency power amplifier circuit device

Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate

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System for connecting an incoming call to a selected one of a nu

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

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