4. Telephonic communications
  5. Having light wave or ultrasonic link for speech or paging...
  6. Including fiber optic link within telephone network

Tuguo Ishikawa

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Diversity reception system in a portable radio apparatus

Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent

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Mobile communication system and its control method

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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Profile ID: LFUS-PAI-P-1021121

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