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发明名称
摘要
申请公布号
SU454371(A1)
申请公布日期
1974.12.25
申请号
SU19721857506
申请日期
1972.12.18
申请人
发明人
分类号
E21D9/06;E21C29/02;F15B11/22;(IPC1-7):F15B11/22;E01G3/02
主分类号
E21D9/06
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