4. Telephonic communications
  5. Private or single line system
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Automatic phone line re-allocation

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

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Sensor system with PT1 measuring device

Telephonic communications – Private or single line system – Lockout
Patent

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Telephone switching system with internal and external channel

Telephonic communications – Private or single line system – Lockout
Patent

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Two-wire intercom with hands-free function

Telephonic communications – Private or single line system – Lockout
Patent

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