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发明名称
摘要
申请公布号
JPS53110176(U)
申请公布日期
1978.09.02
申请号
JP19770015475U
申请日期
1977.02.10
申请人
发明人
分类号
G04B37/04;G04B37/05;G04C3/00;G04G17/02;G04G99/00;(IPC1-7):G04B37/04
主分类号
G04B37/04
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