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发明名称
摘要
申请公布号
BE720044(A)
申请公布日期
1969.02.03
申请号
BED720044
申请日期
1968.08.28
申请人
发明人
分类号
H01J37/305
主分类号
H01J37/305
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代理人
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地址
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