4. Telephonic communications
  5. Private or single line system
  6. Doorbell system
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Call controlling apparatus and method used for an order-wire...

Telephonic communications – Private or single line system – Doorbell system
Reexamination Certificate

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Collective house interphone system and method therefore

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

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Communication controlling apparatus for a single-line telephone

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

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Communication system for use in a mine

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

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Control device for a lift

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

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