4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Masashi Saitoh

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Key switch and electronic device

Electricity: circuit makers and breakers – Solid contact – Membrane type
Reexamination Certificate

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Ring trip circuit for stopping call signal at different...

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2149177

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