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发明名称
摘要
申请公布号
JPS5229172(U)
申请公布日期
1977.03.01
申请号
JP19750116449U
申请日期
1975.08.22
申请人
发明人
分类号
G04B37/08;G04C21/02;G04C21/34;(IPC1-7):G04C21/34
主分类号
G04B37/08
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