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发明名称
摘要
申请公布号
JPS52139782(U)
申请公布日期
1977.10.22
申请号
JP19760034930U
申请日期
1976.03.23
申请人
发明人
分类号
G04G9/00;G04C17/00;G09F9/30;G09G3/04;(IPC1-7):G09F9/30
主分类号
G04G9/00
代理机构
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