4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal
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DC level trip detector

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

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Detection of ground or loop start configuration in telephone loo

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

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Digital tone detector

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

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