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发明名称
摘要
申请公布号
JPS5659693(U)
申请公布日期
1981.05.21
申请号
JP19790142477U
申请日期
1979.10.15
申请人
发明人
分类号
G04G21/00;G04G99/00;G06F3/02;(IPC1-7):G04G1/00
主分类号
G04G21/00
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