Apparatus for controlling and indicating the integrity of the co

Patent

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Details

1791753R, H04B 346, H04M 326

Patent

active

043318436

ABSTRACT:
A system is shown for automatically detecting the integrity of telephone subscriber's line connection to a four wire switching system via a hybrid network.

REFERENCES:
patent: 4139745 (1979-02-01), Ashdown et al.

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