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发明名称
DISC-SHAPED MINING MEMBER
摘要
申请公布号
PL135530(B2)
申请公布日期
1985.11.30
申请号
PL19840247212
申请日期
1984.04.11
申请人
发明人
分类号
E21C;(IPC1-7):E21C25/12
主分类号
E21C
代理机构
代理人
主权项
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