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经营范围
发明名称
Wellhead base assembly
摘要
申请公布号
US3168142(A)
申请公布日期
1965.02.02
申请号
US19610162828
申请日期
1961.12.28
申请人
SHELL OIL COMPANY
发明人
WATKINS BRUCE J.;JOHNSON GLENN D.
分类号
E21B33/035
主分类号
E21B33/035
代理机构
代理人
主权项
地址
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