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发明名称
Valve seat
摘要
申请公布号
GB0409619(D0)
申请公布日期
2004.06.02
申请号
GB20040009619
申请日期
2004.04.30
申请人
SPECIALISED PETROLEUM SERVICES GROUP LIMITED
发明人
分类号
E21B23/08;E21B34/00;E21B34/14
主分类号
E21B23/08
代理机构
代理人
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地址
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