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  5. Polystation line system
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Party line converter

Telephonic communications – Polystation line system – Revertive call
Patent

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Personal computer assisted multiple line access

Telephonic communications – Polystation line system
Reexamination Certificate

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Personal telephone adapter

Telephonic communications – Polystation line system – Call alerting
Patent

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Phone control center for a life safety network

Telephonic communications – Polystation line system
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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Private branch exchange apparatus

Telephonic communications – Polystation line system – Revertive call
Patent

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Process for assigning a called number to customer premises...

Telephonic communications – Polystation line system
Reexamination Certificate

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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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