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发明名称
Cathode for electron discharge devices
摘要
申请公布号
US2426255(A)
申请公布日期
1947.08.26
申请号
US19450613455
申请日期
1945.08.30
申请人
FEDERAL TELEPHONE AND RADIO CORPORATION
发明人
WIDMAIER WILLIAM
分类号
H01J17/06
主分类号
H01J17/06
代理机构
代理人
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地址
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