4. Telephonic communications
  5. Supervisory or control line signaling
  6. Substation originated

Yukiko Iwai

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Automatic dialing device and auxiliary dialing device for a tele

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Automatic switching-back device for telephone circuit

Telephonic communications – Terminal – Switch or switch actuator structure
Patent

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Profile ID: LFUS-PAI-P-411007

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