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

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

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Single-wire data distribution system and method

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

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System for communicating through partitions

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

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