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经营范围
发明名称
SHIELDED MINE ROOF SUPPORT
摘要
申请公布号
PL134883(B1)
申请公布日期
1985.09.30
申请号
PL19810234145
申请日期
1981.12.07
申请人
发明人
分类号
E21D;E21D23/04;(IPC1-7):E21D23/04
主分类号
E21D
代理机构
代理人
主权项
地址
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