4. Telephonic communications
  5. Private or single line system
  6. Doorbell system
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Telephone adaptor for telephone sets

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

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Telephone installations

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

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Telephone system

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

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Two-telephone intercom

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

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Two-way communication system with selective muting

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

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