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经营范围
发明名称
Thermionic cathode and direct current heater assembly
摘要
申请公布号
US2847604(A)
申请公布日期
1958.08.12
申请号
US19550512723
申请日期
1955.06.02
申请人
GENERAL ELECTRIC COMPANY
发明人
BEGGS JAMES E.;WEBSTER HAROLD F.
分类号
H01J1/20;H01J21/36
主分类号
H01J1/20
代理机构
代理人
主权项
地址
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