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发明名称
Foringsrörventil med kort slaglengde
摘要
申请公布号
NO940968(D0)
申请公布日期
1994.03.17
申请号
NO19940000968
申请日期
1994.03.17
申请人
HALLIBURTON CO
发明人
SZARKA, DAVID D.
分类号
E21B;(IPC1-7):E21B
主分类号
E21B
代理机构
代理人
主权项
地址
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