4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With special service

Malcolm D. Muir

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Multifunction two line telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Patent

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Telephone line tester

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Profile ID: LFUS-PAI-P-1355626

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