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发明名称
摘要
申请公布号
JPS52159657(U)
申请公布日期
1977.12.03
申请号
JP19760068700U
申请日期
1976.05.28
申请人
发明人
分类号
G04G9/00;G04B19/04;G04C3/00;(IPC1-7):G04B19/04
主分类号
G04G9/00
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