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发明名称
Device to dislodge off-bottom drill stems stuck in well bores
摘要
申请公布号
US3109488(A)
申请公布日期
1963.11.05
申请号
US19600045237
申请日期
1960.07.25
申请人
JOHNNY HOWARD MARSHALL;JOE SOULE MARSHALL, JR.
发明人
MARSHALL JOE SOULE
分类号
E21B31/03
主分类号
E21B31/03
代理机构
代理人
主权项
地址
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