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发明名称
Ventil
摘要
申请公布号
NO933318(A)
申请公布日期
1994.03.25
申请号
NO19930003318
申请日期
1993.09.17
申请人
HALLIBURTON CO
发明人
COX, DON C.
分类号
E21B34/06;E21B34/14;F16K5/18;(IPC1-7):F16K5/04
主分类号
E21B34/06
代理机构
代理人
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