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经营范围
发明名称
ELECTRET TRANSDUCER
摘要
申请公布号
CA902753(A)
申请公布日期
1972.06.13
申请号
CAD902753
申请日期
申请人
NORTHERN ELECTRIC COMPANY LIMITED
发明人
HENNING S. MADSEN;CORNELIS W. REEDYK
分类号
H04R19/00;H04R19/01;(IPC1-7):H04R19/00
主分类号
H04R19/00
代理机构
代理人
主权项
地址
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