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发明名称
摘要
申请公布号
JPS53124461(U)
申请公布日期
1978.10.03
申请号
JP19770029580U
申请日期
1977.03.11
申请人
发明人
分类号
G09B27/08;G04B19/22;G04C3/00;G04C17/00;(IPC1-7):G04C3/00
主分类号
G09B27/08
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