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发明名称
ELECTRET DEVICES
摘要
申请公布号
GB1340158(A)
申请公布日期
1973.12.12
申请号
GB19720034928
申请日期
1972.07.26
申请人
TOKYO SHIBAURA ELECTRIC CO LTD
发明人
分类号
H01G7/02;H04R19/00;(IPC1-7):H01G7/02;H04R19/04
主分类号
H01G7/02
代理机构
代理人
主权项
地址
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