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发明名称
摘要
申请公布号
DE2157155(A1)
申请公布日期
1972.06.08
申请号
DE19712157155
申请日期
1971.11.17
申请人
发明人
分类号
E02B15/04;E02B15/06;(IPC1-7):E02B15/04
主分类号
E02B15/04
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代理人
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