4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver

Alex Nirshberg

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Integrated cordless telephone with telephone answering device an

Telecommunications – Radiotelephone system – Message storage or retrieval
Patent

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Telephone answering device with low cost dual tone multi-frequen

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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Profile ID: LFUS-PAI-P-389421

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