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发明名称
摘要
申请公布号
JPS5229253(U)
申请公布日期
1977.03.01
申请号
JP19750113734U
申请日期
1975.08.20
申请人
发明人
分类号
G09B23/36;(IPC1-7):G09B23/36
主分类号
G09B23/36
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代理人
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