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Logic control for electronic key telephone line circuit

H - Electricity – 04 – M
Patent

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Long distance call interceptor

H - Electricity – 04 – M
Patent

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Long distance service bureau

H - Electricity – 04 – M
Patent

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Long distance telephone call limiting device

H - Electricity – 04 – M
Patent

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Long distance telephone switching system with enhanced...

H - Electricity – 04 – M
Patent

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Long distance telephone switching system with enhanced...

H - Electricity – 04 – M
Patent

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Long-line telephone circuit

H - Electricity – 04 – M
Patent

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Loop and rate-dependent ds power cutback for power savings...

H - Electricity – 04 – M
Patent

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Loop arrangement to test a remote subscriber's drop from a...

H - Electricity – 04 – M
Patent

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Loop current detector

H - Electricity – 04 – M
Patent

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Loop detecting circuit

H - Electricity – 04 – M
Patent

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Loop driver for pots, xdsl, or integrated pots/xdsl interface

H - Electricity – 04 – M
Patent

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Loop driver for pots, xdsl, or integrated pots/xdsl interface

H - Electricity – 04 – M
Patent

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Loop extender

H - Electricity – 04 – M
Patent

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Loop fault locator

H - Electricity – 04 – M
Patent

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Loop sensing circuit for use with a subscriber loop...

H - Electricity – 04 – M
Patent

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Loop test circuit

H - Electricity – 04 – M
Patent

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Loop to ground start circuit

H - Electricity – 04 – M
Patent

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Loop, dial pulse and ring trip detection circuit

H - Electricity – 04 – M
Patent

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Loop-back test system using a suppressed ringing connection

H - Electricity – 04 – M
Patent

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