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发明名称
摘要
申请公布号
GB1259029(A)
申请公布日期
1972.01.05
申请号
GBD1259029
申请日期
1969.04.08
申请人
发明人
分类号
E02F3/345;E02F9/02;E21D9/00;E21D9/12
主分类号
E02F3/345
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代理人
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