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发明名称
摘要
申请公布号
JPS5675770(U)
申请公布日期
1981.06.20
申请号
JP19790157391U
申请日期
1979.11.13
申请人
发明人
分类号
G09B1/28;G09B3/00;(IPC1-7):G09B3/00
主分类号
G09B1/28
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代理人
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