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发明名称
摘要
申请公布号
JPS569231(Y2)
申请公布日期
1981.02.28
申请号
JP19790170539U
申请日期
1979.12.10
申请人
发明人
分类号
H01J31/15;H01J29/02;H01J29/04;(IPC1-7):H01J29/02
主分类号
H01J31/15
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代理人
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