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发明名称
SYSTEM FOR IMPROVING ACOUSTICS
摘要
申请公布号
GB2062342(A)
申请公布日期
1981.05.20
申请号
GB19800033145
申请日期
1980.10.14
申请人
BOLIN G G A
发明人
分类号
H04R1/20;E04B1/99;E04H3/30;G10K15/00;H04R9/06;H04R27/00;(IPC1-7):G10K11/00
主分类号
H04R1/20
代理机构
代理人
主权项
地址
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