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发明名称
摘要
申请公布号
JPS6417497(U)
申请公布日期
1989.01.27
申请号
JP19870111252U
申请日期
1987.07.20
申请人
发明人
分类号
G04G13/02;G04G21/06;G04G99/00
主分类号
G04G13/02
代理机构
代理人
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地址
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