4. Telephonic communications
  5. Private or single line system
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Digitally controlled intercommunications system

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

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Door intercom device

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

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Door intercom system

Telephonic communications – Private or single line system – At collective house
Reexamination Certificate

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Door security system

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

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