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发明名称
摘要
申请公布号
JPS52155069(U)
申请公布日期
1977.11.25
申请号
JP19760063638U
申请日期
1976.05.19
申请人
发明人
分类号
G04B27/00;G04C9/00;(IPC1-7):G04C9/00
主分类号
G04B27/00
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