4. Telephonic communications
  5. Polystation line system
  6. Call alerting
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Personal telephone adapter

Telephonic communications – Polystation line system – Call alerting
Patent

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Polarity ring director

Telephonic communications – Polystation line system – Call alerting
Patent

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Polarity ring director

Telephonic communications – Polystation line system – Call alerting
Patent

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Programmable selective ringing circuit and method for party tele

Telephonic communications – Polystation line system – Call alerting
Patent

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