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发明名称
摘要
申请公布号
DE2023931(A1)
申请公布日期
1971.04.22
申请号
DE19702023931
申请日期
1970.05.15
申请人
发明人
分类号
E01B27/06;E01B27/11;E01B29/05;(IPC1-7):E01B29/02
主分类号
E01B27/06
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