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发明名称
Resiliently coupled drill bit
摘要
申请公布号
US2740651(A)
申请公布日期
1956.04.03
申请号
US19510214993
申请日期
1951.03.10
申请人
ESSO RESEARCH AND ENGINEERING COMPANY
发明人
ORTLOFF JOHN E.
分类号
E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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