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经营范围
发明名称
Vacuum tube and method of manufacture thereof
摘要
申请公布号
US2290748(A)
申请公布日期
1942.07.21
申请号
US19410381821
申请日期
1941.03.05
申请人
HAZELTINE CORPORATION
发明人
HERGENROTHER RUDOLF C.
分类号
H01J19/42
主分类号
H01J19/42
代理机构
代理人
主权项
地址
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