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发明名称
Well drilling bit
摘要
申请公布号
US3326308(A)
申请公布日期
1967.06.20
申请号
US19650474098
申请日期
1965.07.22
申请人
JOHN G. ELSTRAND
发明人
WHITE MARVIN E.
分类号
E21B10/62;E21B10/627
主分类号
E21B10/62
代理机构
代理人
主权项
地址
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