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发明名称
Cathode for use in electrical discharge devices
摘要
申请公布号
US2817784(A)
申请公布日期
1957.12.24
申请号
US19520277139
申请日期
1952.01.23
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
KATZ HELMUT
分类号
H01J1/28
主分类号
H01J1/28
代理机构
代理人
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