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发明名称
MINING ROOF-SUPPORT
摘要
申请公布号
PL117806(B2)
申请公布日期
1981.08.31
申请号
PL19780210367
申请日期
1978.10.17
申请人
发明人
分类号
E21D;E21D19/02;E21D23/00;(IPC1-7):E21D23/00
主分类号
E21D
代理机构
代理人
主权项
地址
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