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发明名称
IMPACT-TYPE DRILLING RIG
摘要
申请公布号
PL112338(B2)
申请公布日期
1980.10.31
申请号
PL19770195761
申请日期
1977.02.02
申请人
发明人
分类号
E21B;(IPC1-7):E21C11/02
主分类号
E21B
代理机构
代理人
主权项
地址
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