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发明名称
Multi-string packers
摘要
申请公布号
GB2238811(A)
申请公布日期
1991.06.12
申请号
GB19900024317
申请日期
1990.11.08
申请人
* NODECO LIMITED
发明人
GEORGE * TELFER
分类号
E21B33/122
主分类号
E21B33/122
代理机构
代理人
主权项
地址
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