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发明名称
摘要
申请公布号
JPS5317866(Y2)
申请公布日期
1978.05.13
申请号
JP19740155380U
申请日期
1974.12.21
申请人
发明人
分类号
G09B3/00;G09B1/08;G09B3/10;(IPC1-7):G09B3/00
主分类号
G09B3/00
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代理人
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