4. Telecommunications
  5. Radiotelephone system
  6. Emergency or alarm communication

Warren Burks

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Call box with keyboard communication

Telecommunications – Radiotelephone system – Emergency or alarm communication
Patent

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Call box with keyboard communication

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-594370

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