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经营范围
发明名称
ELECTRET MICROPHONE SHIELD
摘要
申请公布号
EP0077615(B1)
申请公布日期
1986.04.30
申请号
EP19820305196
申请日期
1982.09.30
申请人
NORTHERN TELECOM LIMITED
发明人
CHAPUT, GUY JOHN;SICH, EDWARD MATTHEW;GUMB, BEVERLEY WILLIAM THOMAS
分类号
H04R1/22;H04R19/01;H04R19/04;(IPC1-7):H04R19/00
主分类号
H04R1/22
代理机构
代理人
主权项
地址
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