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发明名称
IMPROVEMENTS IN OR RELATING TO THE DRILLING OR CUTTING OF EARTH STRATA
摘要
申请公布号
ZM14970(A1)
申请公布日期
1971.08.23
申请号
ZM19700000149
申请日期
1970.12.30
申请人
MINING DEV AG
发明人
分类号
E21B7/00;E21B19/084;(IPC1-7):E21C/
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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