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经营范围
发明名称
RETRIEVABLE WELL SCREEN
摘要
申请公布号
US3548937(A)
申请公布日期
1970.12.22
申请号
USD3548937
申请日期
1969.04.01
申请人
ESSO PRODUCTION RESEARCH CO.
发明人
OTHAR M. KIEL
分类号
E21B31/00;E21B43/08;E21B43/10;(IPC1-7):E03B3/18;E21B43/00
主分类号
E21B31/00
代理机构
代理人
主权项
地址
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