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摘要
申请公布号
JPS5499666(U)
申请公布日期
1979.07.13
申请号
JP19770174240U
申请日期
1977.12.23
申请人
发明人
分类号
G04B39/00;(IPC1-7):G04B39/00
主分类号
G04B39/00
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