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发明名称
摘要
申请公布号
DE2120012(A1)
申请公布日期
1971.11.11
申请号
DE19712120012
申请日期
1971.04.23
申请人
发明人
分类号
E02D;E21B;E21B21/00;E21B33/138;E21B43/00;E21B43/02;E21B43/25;(IPC1-7):E21B33/13
主分类号
E02D
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代理人
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地址
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