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发明名称
Valve assembly
摘要
申请公布号
GB0012206(D0)
申请公布日期
2000.07.12
申请号
GB20000012206
申请日期
2000.05.19
申请人
FRENCH OILFIELD SERVICES LIMITED
发明人
分类号
E21B21/00;E21B34/00;E21B34/06;E21B34/10
主分类号
E21B21/00
代理机构
代理人
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地址
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