4. Telecommunications
  5. Transmitter and receiver at separate stations
  6. Plural transmitters or receivers

Lars Gunnar Folke Ahlström

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Method and apparatus for using a B-answer signal to prevent...

Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate

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Method and apparatus for using a VM tone to prevent a voice...

Telephonic communications – Audio message storage – retrieval – or synthesis – Message management
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Profile ID: LFUS-PAI-P-2498453

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