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发明名称
摘要
申请公布号
JPS5532445(U)
申请公布日期
1980.03.01
申请号
JP19780115583U
申请日期
1978.08.23
申请人
发明人
分类号
G04B45/00;(IPC1-7):G04B45/00
主分类号
G04B45/00
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代理人
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