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United States of America Patent
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Oct 24, 2006
Issued Date -
N/A
app pub date -
Apr 18, 2000
filing date -
Apr 19, 1999
priority date (Note) -
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Abstract
Each of a plurality of mobile stations is provided with a plurality of extension numbers including at least one unique extension number, and different lines are set for the plurality of extension numbers respectively. This enables a call using a line even when another call is made using another line.
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