4. Telephonic communications
  5. Substation or terminal circuitry
  6. Conversion of signal form

Khaled Azem

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Telephone in-use indicator

Telephonic communications – Substation or terminal circuitry – Visual signalling
Patent

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Telephone line seizure circuit

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
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Profile ID: LFUS-PAI-P-369998

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