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发明名称
摘要
申请公布号
JPS56102570(U)
申请公布日期
1981.08.11
申请号
JP19790181605U
申请日期
1979.12.29
申请人
发明人
分类号
G09B23/28;(IPC1-7):G09B23/28
主分类号
G09B23/28
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代理人
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地址
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