4. Telephonic communications
  5. Private or single line system
  6. Doorbell system
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Integrated communications control device for a small office conf

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

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Integrated telephone intercommunication and alarm electronic con

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

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Intercom system

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

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Intercom with transducer enclosure to attenuate resonant frequen

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

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Intercommunication system

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

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Internal telephone intercom system

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

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Interphone system

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

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