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发明名称
Christmas tree and wellhead design
摘要
申请公布号
GB2460338(B)
申请公布日期
2012.03.28
申请号
GB20090009108
申请日期
2009.05.28
申请人
VETCO GRAY INC.
发明人
CASPAR LEWIS
分类号
E21B33/035;E21B34/04
主分类号
E21B33/035
代理机构
代理人
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