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发明名称
摘要
申请公布号
JPS5270054(U)
申请公布日期
1977.05.25
申请号
JP19750156059U
申请日期
1975.11.17
申请人
发明人
分类号
G09B15/02;G09B15/06;(IPC1-7):G09B15/06
主分类号
G09B15/02
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代理人
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