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经营范围
发明名称
Well cementing stage collar
摘要
申请公布号
GB2161516(A)
申请公布日期
1986.01.15
申请号
GB19840017757
申请日期
1984.07.12
申请人
FRED N * ELEY
发明人
FRED N * ELEY
分类号
E21B33/16;(IPC1-7):E21B33/14
主分类号
E21B33/16
代理机构
代理人
主权项
地址
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