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发明名称
Swivel seal assembly for washpipe
摘要
申请公布号
EP1849957(B1)
申请公布日期
2011.10.19
申请号
EP20070251713
申请日期
2007.04.24
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
RILEY, ANDREW DALE;WEAVER, RANDALL FERRAIN
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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