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经营范围
发明名称
A valve for controlling fluid flow in an oil or gas well
摘要
申请公布号
GB9425135(D0)
申请公布日期
1995.02.08
申请号
GB19940025135
申请日期
1994.12.13
申请人
PBL DRILLING TOOLS LIMITED
发明人
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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