4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Switching or supervision feature

Koichiro Kashiwagi

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Key telephone system with reduction of delay of ring tone genera

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

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Phone apparatus having redialing function capable of surely...

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

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Telephone set and response method to incoming call

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1271048

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