4. Telephonic communications
  5. Centralized switching system
  6. With generating of call associated substation signal
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Personal branch exchange system

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

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Power amplifier

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

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Programmable call progress tones for a switching system

Telephonic communications – Centralized switching system – With generating of call associated substation signal
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Programmable ring signal generator

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

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