4. Telephonic communications
  5. Private or single line system
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Page party system

Telephonic communications – Private or single line system – Having plural stations with selective calling
Patent

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Patient operator intercom arrangements for magnetic resonance im

Telephonic communications – Private or single line system – Doorbell system
Patent

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Personal handy phone system

Telephonic communications – Private or single line system – Doorbell system
Patent

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Portable through-door intercom

Telephonic communications – Private or single line system – Doorbell system
Patent

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Power line telephone communications system having on hook digita

Telephonic communications – Private or single line system – With call addressing
Patent

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Privacy mode system and method for home network telephone

Telephonic communications – Private or single line system
Reexamination Certificate

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Private telephone system using a personal code number to access

Telephonic communications – Private or single line system – Having plural stations with selective calling
Patent

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