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发明名称
摘要
申请公布号
SU465674(A1)
申请公布日期
1975.03.30
申请号
SU19681262931
申请日期
1968.08.16
申请人
发明人
分类号
H01J9/38;(IPC1-7):H01J9/38
主分类号
H01J9/38
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代理人
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