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发明名称
Apparatus for circulating drilling fluids
摘要
申请公布号
US2252050(A)
申请公布日期
1941.08.12
申请号
US19390297328
申请日期
1939.09.30
申请人
SHELL DEVELOPMENT COMPANY
发明人
THOMPSON NELSON W.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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