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发明名称
IMPROVEMENTS IN ACOUSTIC ATTENUATION
摘要
申请公布号
GB2172769(B)
申请公布日期
1988.07.06
申请号
GB19850007445
申请日期
1985.03.21
申请人
* TOPEXPRESS LTD
发明人
MARTIN JOHN * SAXON
分类号
A61F11/14;G10K11/178;(IPC1-7):H04R3/00
主分类号
A61F11/14
代理机构
代理人
主权项
地址
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