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经营范围
发明名称
Thermionic cathode
摘要
申请公布号
US2507812(A)
申请公布日期
1950.05.16
申请号
US19460689881
申请日期
1946.08.12
申请人
A. C. COSSOR LIMITED
发明人
PHIPPS DARRELL CECIL
分类号
H01J1/20;H01J3/02;H01J29/04
主分类号
H01J1/20
代理机构
代理人
主权项
地址
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