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经营范围
发明名称
WELLHEAD WITH ECCENTRIC CASING SEAL RING
摘要
申请公布号
GB8828315(D0)
申请公布日期
1989.01.05
申请号
GB19880028315
申请日期
1988.12.05
申请人
VETCO GRAY INC
发明人
分类号
E21B33/04;(IPC1-7):E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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