4. Telephonic communications
  5. Call or terminal access alarm or control
  6. At substation
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Timed telephone silencer. (telephone silencer with timer functio

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

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Timer control for telephone

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

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Timing circuit and a secure telephone jack utilizing this circui

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

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Toll call restrictor method and apparatus

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

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Unauthorized call defeat apparatus

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

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Universal outgoing call restriction circuit

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

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