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发明名称
摘要
申请公布号
JPS5245562(B2)
申请公布日期
1977.11.17
申请号
JP19740037129
申请日期
1974.04.02
申请人
发明人
分类号
E01B9/40;E01B9/68
主分类号
E01B9/40
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