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发明名称
摘要
申请公布号
JPS5614801(B2)
申请公布日期
1981.04.07
申请号
JP19740050983
申请日期
1974.05.08
申请人
发明人
分类号
E01B3/40;E01B1/00;E01B9/28
主分类号
E01B3/40
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