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发明名称
摘要
申请公布号
JPS56703(U)
申请公布日期
1981.01.07
申请号
JP19790081944U
申请日期
1979.06.14
申请人
发明人
分类号
E01B25/10;E01B25/08;E01B25/22;E01B25/28;(IPC1-7):E01B25/08
主分类号
E01B25/10
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