4. Telephonic communications
  5. Private or single line system
  6. Doorbell system

David Jeffrey Westergaard

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Method and apparatus for removing FSK in-band signaling

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Remote answering of doorbell

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

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Subscriber equipment muting method and apparatus

Telephonic communications – Special services – Call waiting
Patent

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Profile ID: LFUS-PAI-P-881060

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