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发明名称
摘要
申请公布号
NL6917995(A)
申请公布日期
1970.06.23
申请号
NL19690017995
申请日期
1969.12.01
申请人
发明人
分类号
H01J17/49;(IPC1-7):H01J65/04
主分类号
H01J17/49
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