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发明名称
Drilling and coring tool
摘要
申请公布号
US1791370(A)
申请公布日期
1931.02.03
申请号
US19260138306
申请日期
1926.09.28
申请人
OKSENHOLT JENS N;COLEMAN JAMES A
发明人
OKSENHOLT JENS N.;COLEMAN JAMES A.
分类号
E21B10/02
主分类号
E21B10/02
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代理人
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