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经营范围
发明名称
Improvements in or relating to ultra-high-frequency electron-discharge tubes of the velocity-modulation type
摘要
申请公布号
GB630069(A)
申请公布日期
1949.10.05
申请号
GB19450016457
申请日期
1945.06.28
申请人
SPERRY GYROSCOPE COMPANY, INC.
发明人
分类号
H01J25/12
主分类号
H01J25/12
代理机构
代理人
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