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

Ryozo Nunokawa

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Communications system using portable recording medium

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Communications system using portable recording medium

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

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Communications system using portable recording medium

Telephonic communications – Audio message storage – retrieval – or synthesis – Message management
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1483249

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