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发明名称
Improvements in or relating to cathodes for electric discharge tubes
摘要
申请公布号
GB721612(A)
申请公布日期
1955.01.12
申请号
GB19520009728
申请日期
1952.04.17
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H01J1/14;H01J1/28
主分类号
H01J1/14
代理机构
代理人
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