4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal
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Adaptive multitone signaling method

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

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Amplifier with double rail output

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

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Apparatus and method for determining the source of a telephone c

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

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