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发明名称
MINING METHOD AND CHOCK ASSEMBLY THEREFOR
摘要
申请公布号
GB1570697(A)
申请公布日期
1980.07.09
申请号
GB19760051715
申请日期
1976.12.10
申请人
PEABODY COAL CO
发明人
分类号
E21D23/04;E21D23/08;(IPC1-7):E21D23/00
主分类号
E21D23/04
代理机构
代理人
主权项
地址
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