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摘要
申请公布号
JPS56175861(U)
申请公布日期
1981.12.25
申请号
JP19800073912U
申请日期
1980.05.30
申请人
发明人
分类号
G09B19/02;(IPC1-7):G09B19/02
主分类号
G09B19/02
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