4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Monitoring

Vakis Eftechiou

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Alerting device for telephones

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Telephone privacy and alerting device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Telephone privacy device

Telephonic communications – Call or terminal access alarm or control – Lockout or double use signalling
Patent

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Profile ID: LFUS-PAI-P-1061854

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