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发明名称
Means for drilling wells
摘要
申请公布号
US1888814(A)
申请公布日期
1932.11.22
申请号
US19310569665
申请日期
1931.10.19
申请人
ABERCROMBIE JAMES S
发明人
ABERCROMBIE JAMES S.
分类号
E21B17/07;E21B19/08
主分类号
E21B17/07
代理机构
代理人
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