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经营范围
发明名称
Thermionic tube
摘要
申请公布号
US1889105(A)
申请公布日期
1932.11.29
申请号
US19300428102
申请日期
1930.02.13
申请人
ROGERS RADIO TUBES LIMITED
发明人
PARKER HENRY W.
分类号
H01J19/30
主分类号
H01J19/30
代理机构
代理人
主权项
地址
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