Apparatus for controlling and indicating the integrity of the connection of telephone subscribers to a switching system
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United States of America Patent
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-
May 25, 1982
Grant Date -
N/A
app pub date -
Dec 29, 1980
filing date -
Dec 29, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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