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经营范围
发明名称
Flexible centralizer
摘要
申请公布号
US4938299(A)
申请公布日期
1990.07.03
申请号
US19890386415
申请日期
1989.07.27
申请人
BAROID TECHNOLOGY, INC.
发明人
JELSMA, HENK H.
分类号
E21B7/06;E21B17/10;E21B17/20
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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