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发明名称
摘要
申请公布号
JPS5475614(U)
申请公布日期
1979.05.29
申请号
JP19770148307U
申请日期
1977.11.07
申请人
发明人
分类号
H01J31/28;H01J9/02;(IPC1-7):H01J9/02
主分类号
H01J31/28
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