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发明名称
VORRICHTUNG ZUR SCHÄTZUNG DES RÜCKKOPPLUNGSPEGEL ZWISCHEN LAUTSPRECHER UND MIKROPHON
摘要
申请公布号
DE69324002(D1)
申请公布日期
1999.04.22
申请号
DE19936024002
申请日期
1993.01.08
申请人
PICTURETEL CORP., DANVERS, MASS., US
发明人
CHU, PETER, L., NEEDHAM, MA 02192, US
分类号
H04J1/00;H04B3/23;H04M9/08;H04R3/02;(IPC1-7):H04M9/08
主分类号
H04J1/00
代理机构
代理人
主权项
地址
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