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发明名称
摘要
申请公布号
JPS5495710(U)
申请公布日期
1979.07.06
申请号
JP19770170946U
申请日期
1977.12.19
申请人
发明人
分类号
E01B5/16;(IPC1-7):E01B5/16
主分类号
E01B5/16
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