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经营范围
发明名称
Thermionic valve
摘要
申请公布号
US1959039(A)
申请公布日期
1934.05.15
申请号
US19280287144
申请日期
1928.06.21
申请人
RADIO CORPORATION
发明人
ROUND HENRY JOSEPH
分类号
H01J21/36
主分类号
H01J21/36
代理机构
代理人
主权项
地址
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