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发明名称
摘要
申请公布号
NL7208350(A)
申请公布日期
1972.12.28
申请号
NL19720008350
申请日期
1972.06.19
申请人
发明人
分类号
H01J31/15;(IPC1-7):H01J21/36;G09F9/30
主分类号
H01J31/15
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