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发明名称
摘要
申请公布号
SU380780(A1)
申请公布日期
1973.05.15
申请号
SU19711654174
申请日期
1971.05.13
申请人
发明人
分类号
E01C23/09;(IPC1-7):E01C23/09
主分类号
E01C23/09
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代理人
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