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发明名称
摘要
PURPOSE:To widen the range of speaker's reproduction frequencies.
申请公布号
JPS552120(B2)
申请公布日期
1980.01.18
申请号
JP19750081697
申请日期
1975.07.01
申请人
发明人
分类号
H04R9/04;H04R7/16;H04R9/06
主分类号
H04R9/04
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