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发明名称
摘要
申请公布号
JPS6430492(U)
申请公布日期
1989.02.23
申请号
JP19870124907U
申请日期
1987.08.17
申请人
发明人
分类号
G04C3/14;G04G3/00;(IPC1-7):G04G3/00
主分类号
G04C3/14
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