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发明名称
摘要
申请公布号
JPS54139875(U)
申请公布日期
1979.09.28
申请号
JP19780036421U
申请日期
1978.03.22
申请人
发明人
分类号
G04G9/00;G04B19/32;G04C17/00;G09F9/00;(IPC1-7):G04C17/00
主分类号
G04G9/00
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