4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Line status indication or call alerting

Yoshiyuki Kokubun

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Dealing call terminal device

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Reexamination Certificate

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Remote trading call terminals in a trading call system

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate

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Trading telephone

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Profile ID: LFUS-PAI-P-369955

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