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发明名称
METHOD OF PROTECTING A LONGWALL/GALLERY CROSSING
摘要
申请公布号
PL129521(B1)
申请公布日期
1984.05.31
申请号
PL19800226872
申请日期
1980.09.23
申请人
发明人
分类号
E21D;E21D19/00;E21D23/00;(IPC1-7):E21D19/00
主分类号
E21D
代理机构
代理人
主权项
地址
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