4. Pulse or digital communications
  5. Repeaters
  6. Testing

Michihiro Izumi

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Call waiting notifying apparatus

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

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Communicating apparatus

Telephonic communications – Special services – Call diversion
Reexamination Certificate

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Communicating apparatus, control method of communicating...

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Reexamination Certificate

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Communication apparatus

Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate

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Communication apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Profile ID: LFUS-PAI-P-67874

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