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发明名称
摘要
申请公布号
SU423203(A1)
申请公布日期
1974.04.05
申请号
SU19721748504
申请日期
1972.02.07
申请人
发明人
分类号
H01J31/38;(IPC1-7):H01J31/38
主分类号
H01J31/38
代理机构
代理人
主权项
地址
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