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发明名称
Pressure lubricated drill bit bearing
摘要
申请公布号
US3244459(A)
申请公布日期
1966.04.05
申请号
US19630292048
申请日期
1963.07.01
申请人
ESSO PRODUCTION RESEARCH COMPANY
发明人
ORTLOFF JOHN E.
分类号
E21B10/24
主分类号
E21B10/24
代理机构
代理人
主权项
地址
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