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发明名称
摘要
申请公布号
JPS5616552(Y2)
申请公布日期
1981.04.17
申请号
JP19750004755U
申请日期
1974.12.25
申请人
发明人
分类号
G04B39/02;G04B39/00;(IPC1-7):G04B39/00
主分类号
G04B39/02
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代理人
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