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United States of America Patent
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-
Mar 19, 1985
Grant Date -
N/A
app pub date -
Sep 12, 1983
filing date -
Sep 12, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lamp is provided on a telephone handset to notify the user that a message is waiting. The lamp is energized by a 1 hertz square wave obtained by demodulating a high frequency carrier sent from a transmitter.
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