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

Brian G. Laird

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Paging system that allows caller/subscriber interconnection

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

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Paging system that allows caller/subscriber interconnection

Telephonic communications – Emergency or alarm communications – With automatic dialing or transmission of recorded audio...
Patent

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