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

W. Cumming

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Electrodynamic transducer including inset

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent

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Location registration system enabling a radio telephone set to a

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Method for selecting a broadcast voice channel served in a telep

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

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