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发明名称
摘要
申请公布号
NL6915666(A)
申请公布日期
1970.04.20
申请号
NL19690015666
申请日期
1969.10.16
申请人
发明人
分类号
E01B29/06;(IPC1-7):E01B29/10
主分类号
E01B29/06
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