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发明名称
摘要
申请公布号
JPS6326920(Y2)
申请公布日期
1988.07.21
申请号
JP19800165107U
申请日期
1980.11.17
申请人
发明人
分类号
H01J31/20;H01J29/00;H01J29/34;H01J29/89;(IPC1-7):H01J29/34
主分类号
H01J31/20
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