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发明名称
ACOUSTIC SYSTEMS
摘要
申请公布号
GB8711175(D0)
申请公布日期
1987.06.17
申请号
GB19870011175
申请日期
1987.05.12
申请人
FARR LTD, A E
发明人
分类号
E01F8/02;G10K11/16
主分类号
E01F8/02
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代理人
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