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发明名称
摘要
申请公布号
JPS54102804(U)
申请公布日期
1979.07.19
申请号
JP19770179293U
申请日期
1977.12.28
申请人
发明人
分类号
E01B29/04;E01B29/16;E01B33/00;(IPC1-7):E01B29/04
主分类号
E01B29/04
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