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发明名称
ACOUSTIC ATTENUATION
摘要
申请公布号
GB8507445(D0)
申请公布日期
1985.05.01
申请号
GB19850007445
申请日期
1985.03.21
申请人
TOPEXPRESS LTD
发明人
分类号
A61F11/14;G10K11/178
主分类号
A61F11/14
代理机构
代理人
主权项
地址
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