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经营范围
发明名称
WELL SCREEN
摘要
申请公布号
GB1473801(A)
申请公布日期
1977.05.18
申请号
GB19750013326
申请日期
1975.04.01
申请人
EXXON PROD RES CO
发明人
分类号
E21B43/04;E21B43/08;(IPC1-7):E21B43/08
主分类号
E21B43/04
代理机构
代理人
主权项
地址
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