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经营范围
发明名称
LONGWALL LOUDSPEAKING DEVICE
摘要
申请公布号
PL266268(A1)
申请公布日期
1989.02.06
申请号
PL19870266268
申请日期
1987.06.12
申请人
发明人
分类号
E21F;E21F11/00;E21F17/18;G01R;(IPC1-7):E21F/;G01R/
主分类号
E21F
代理机构
代理人
主权项
地址
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