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发明名称
摘要
申请公布号
JPS531010(Y2)
申请公布日期
1978.01.12
申请号
JP19730040543U
申请日期
1973.04.05
申请人
发明人
分类号
G04B25/00;G04C19/00;G04C21/16;(IPC1-7):G04B25/00
主分类号
G04B25/00
代理机构
代理人
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