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

Toshimi Kurumada

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Command system for performing centralized management of data...

Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal lenses other than for eyewear
Reexamination Certificate

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Line status display system for telephone exchange system

Telephonic communications – Centralized switching system – Identification
Patent

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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-369954

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