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发明名称
Combination drill collar and turbine driven bit
摘要
申请公布号
US3021910(A)
申请公布日期
1962.02.20
申请号
US19600000880
申请日期
1960.01.06
申请人
MARTIN JOHN H
发明人
MARTIN JOHN H.
分类号
E21B4/02
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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