4. Telephonic communications
  5. Call or terminal access alarm or control
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Line information security interface for TAPI service provider

Telephonic communications – Call or terminal access alarm or control – At switching center
Reexamination Certificate

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Line selection method and line selection system for private...

Telephonic communications – Call or terminal access alarm or control – At switching center
Reexamination Certificate

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Lockout apparatus for controlling communications on a single...

Telephonic communications – Call or terminal access alarm or control – At substation
Reexamination Certificate

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Lockout telephone

Telephonic communications – Call or terminal access alarm or control – At substation
Patent

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