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发明名称
摘要
申请公布号
USRE34111(E)
申请公布日期
1992.10.27
申请号
US19920831107
申请日期
1992.02.04
申请人
发明人
分类号
E21B43/12
主分类号
E21B43/12
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代理人
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地址
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