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发明名称
Apparatus and method
摘要
申请公布号
GB0111413(D0)
申请公布日期
2001.07.04
申请号
GB20010011413
申请日期
2001.05.09
申请人
E TECH LIMITED
发明人
分类号
E21B4/00;E21B43/10
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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