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经营范围
发明名称
A POPPET-VALVE.
摘要
申请公布号
AR245257(A1)
申请公布日期
1993.12.30
申请号
AR19900317044
申请日期
1990.06.06
申请人
HALLIBURTON COMPANY
发明人
分类号
E21B34/08;F16K15/00;(IPC1-7):E21B34/08
主分类号
E21B34/08
代理机构
代理人
主权项
地址
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