4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal
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Telecommunication line circuit

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Telecommunication system having a capability of changing the ale

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Telephone exchange apparatus and tone sending method in telephon

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Telephone network alerting cadence control system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent

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Tone sending device of electronic private branch exchange

Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate

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