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发明名称
摘要
申请公布号
JPS482457(U)
申请公布日期
1973.01.12
申请号
JP19710040962U
申请日期
1971.05.20
申请人
发明人
分类号
H01J31/20;H01J29/07;(IPC1-7):H01J29/07
主分类号
H01J31/20
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代理人
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