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发明名称
摘要
申请公布号
JPS6216703(Y2)
申请公布日期
1987.04.27
申请号
JP19810016226U
申请日期
1981.02.06
申请人
发明人
分类号
G04G5/00;G04B37/14;G04G17/02;G04G21/00
主分类号
G04G5/00
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