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发明名称
摘要
申请公布号
JPS57162589(U)
申请公布日期
1982.10.13
申请号
JP19810050020U
申请日期
1981.04.07
申请人
发明人
分类号
G04B39/00;G04G99/00;(IPC1-7):G04G1/00
主分类号
G04B39/00
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