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发明名称
摘要
申请公布号
JPS5248450(U)
申请公布日期
1977.04.06
申请号
JP19750135293U
申请日期
1975.10.02
申请人
发明人
分类号
G04B19/14;G04B19/10;(IPC1-7):G04B19/10
主分类号
G04B19/14
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