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发明名称
DRILL STRING SAFETY VALVE
摘要
申请公布号
GB2099045(B)
申请公布日期
1985.02.27
申请号
GB19820012776
申请日期
1982.05.04
申请人
CHRISTENSEN INC
发明人
分类号
E21B21/10;E21B34/08;(IPC1-7):E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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