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发明名称
摘要
申请公布号
JPS52159664(U)
申请公布日期
1977.12.03
申请号
JP19760068701U
申请日期
1976.05.28
申请人
发明人
分类号
G04B27/04;G04B27/00;G04C3/00;G04C9/00;G04C9/04;(IPC1-7):G04C3/00
主分类号
G04B27/04
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