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发明名称
摘要
申请公布号
JPH0768880(B2)
申请公布日期
1995.07.26
申请号
JP19900206775
申请日期
1990.08.06
申请人
发明人
分类号
E21F13/02;(IPC1-7):E21F13/02
主分类号
E21F13/02
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