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经营范围
发明名称
BYPASS VALVE
摘要
申请公布号
US5193621(A)
申请公布日期
1993.03.16
申请号
US19910693759
申请日期
1991.04.30
申请人
HALLIBURTON COMPANY
发明人
MANKE, KEVIN R.;RINGGENBERG, PAUL D.
分类号
E21B34/12
主分类号
E21B34/12
代理机构
代理人
主权项
地址
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