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发明名称
摘要
申请公布号
DD126057(A1)
申请公布日期
1977.06.15
申请号
DD19760193191
申请日期
1976.06.04
申请人
发明人
分类号
E01B9/14;E01B9/18;(IPC1-7):E01B9/14
主分类号
E01B9/14
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