Switching control apparatus for intercom-telephone sets
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United States of America Patent
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-
Dec 27, 1988
Grant Date -
N/A
app pub date -
Feb 24, 1987
filing date -
Feb 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching control apparatus for intercom-telephone sets includes a switching control circuit and a surge protection circuit electrically coupled with a talking circuit for increasing the reliability of the intercom-telephone operation, reducing the cost of manufacturing the product and protecting the intercom-telephone sets against high voltage surges which may damage the intercom-telephone sets during electrical storms.
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