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发明名称
摘要
申请公布号
JPS569681(Y2)
申请公布日期
1981.03.04
申请号
JP19760120220U
申请日期
1976.09.07
申请人
发明人
分类号
E01B5/02;E01B19/00;E01B31/02;(IPC1-7):E01B31/02
主分类号
E01B5/02
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