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发明名称
DOWNHOLE ASSEMBLY
摘要
申请公布号
GB8910326(D0)
申请公布日期
1989.06.21
申请号
GB19890010326
申请日期
1989.05.05
申请人
ORECO OILFIELD SERVICES LIMITED
发明人
分类号
E21B23/02;E21B25/16;E21B31/18;E21B47/01;E21B47/024
主分类号
E21B23/02
代理机构
代理人
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地址
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