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

Pierre Sorriaux

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Device for signalling spatial separation or closeness beyond...

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Switching system with video switching matrix

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-386537

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