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发明名称
Mud release valve
摘要
申请公布号
US2728547(A)
申请公布日期
1955.12.27
申请号
US19500197424
申请日期
1950.11.24
申请人
ESSO RESEARCH AND ENGINEERING COMPANY
发明人
CROOKSTON ROBERT R.;GRIFFIN HAROLD F.
分类号
E21B21/10;F16K31/126
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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