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Power and signal transmission system

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Power cross detection using loop current and voltage

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Power up reset circuit for line powered circuit

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Primary telephone line protector with failsafe

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Protection arrangement for a telephone subscriber line interface

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protection circuit for telephone systems

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protection circuit for use with a telephone appliance and method

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protection circuit/method for subscriber telephone interface...

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Protection device for terminal equipment on telephone subscriber

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protection of active telephone line interface circuits

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protective plug for distribution frame devices in...

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Protector device

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Protector interface

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Protector module for quick clip terminal telephone connector blo

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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