4. Telephonic communications
  5. Multi-line or key substation system with selective switching...

Yoshihito Nagano

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Digital button telephone system and extension terminal for...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2072385

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