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发明名称
摘要
申请公布号
NL6707059(A)
申请公布日期
1968.02.12
申请号
NL19670007059
申请日期
1967.05.22
申请人
发明人
分类号
H01J23/027;H01J41/12;H01J41/16;H01J41/20
主分类号
H01J23/027
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代理人
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