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发明名称
Dual metal seat for wellhead housing
摘要
申请公布号
GB2305951(A)
申请公布日期
1997.04.23
申请号
GB19960020597
申请日期
1996.10.03
申请人
* FMC CORPORATION
发明人
DONALD B * WAFER
分类号
E21B33/00;E21B33/03;F16J15/08;(IPC1-7):E21B33/03;F16L23/20
主分类号
E21B33/00
代理机构
代理人
主权项
地址
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