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经营范围
发明名称
ELECTROACOUSTIC TRANSDUCER
摘要
申请公布号
GB1247434(A)
申请公布日期
1971.09.22
申请号
GB19690011832
申请日期
1969.03.05
申请人
HITACHI LTD
发明人
分类号
H04R7/20
主分类号
H04R7/20
代理机构
代理人
主权项
地址
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