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摘要
申请公布号
BG20416(A3)
申请公布日期
1975.11.05
申请号
BG19720020268
申请日期
1972.04.20
申请人
发明人
分类号
H04R1/22;H04R7/18;(IPC1-7):H04R17/00
主分类号
H04R1/22
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