Method and apparatus for installing telephone intercom-voice messaging apparatus at doorbell for dwelling
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United States of America Patent
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-
Jul 21, 1998
Grant Date -
N/A
app pub date -
Nov 1, 1996
filing date -
Nov 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A doorbell response system can be retrofit in an existing doorbell system without requiring the incorporation of new wiring in the existing doorbell system.
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