4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal
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Solid state ringing switch

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

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Splitter for analog telephone signal and digital data

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

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Subscriber apparatus with ringer generator for sending ringer si

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

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System and apparatus for generating within the premises a dial t

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

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