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发明名称
Drilling mud flow system
摘要
申请公布号
US2632631(A)
申请公布日期
1953.03.24
申请号
US19490091708
申请日期
1949.05.06
申请人
STANDARD OIL DEVELOPMENT COMPANY
发明人
GRIFFIN HAROLD F.;CROOKSTON ROBERT R.
分类号
E21B21/08
主分类号
E21B21/08
代理机构
代理人
主权项
地址
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