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发明名称
摘要
申请公布号
JPS5659300(U)
申请公布日期
1981.05.21
申请号
JP19790141945U
申请日期
1979.10.12
申请人
发明人
分类号
E03F3/04;E21D11/38;E21F16/02;(IPC1-7):E21F16/02
主分类号
E03F3/04
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