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摘要
申请公布号
JPH0392897(U)
申请公布日期
1991.09.20
申请号
JP19900001587U
申请日期
1990.01.10
申请人
发明人
分类号
G03B21/56;H04R17/00;(IPC1-7):H04R17/00
主分类号
G03B21/56
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