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经营范围
发明名称
Thermionic tube
摘要
申请公布号
US1991632(A)
申请公布日期
1935.02.19
申请号
US19320623116
申请日期
1932.07.18
申请人
HEINTZ & KAUFMAN, LTD.
发明人
SCOFLELD PHILIP F.
分类号
H01J21/02
主分类号
H01J21/02
代理机构
代理人
主权项
地址
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