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经营范围
发明名称
Vacuum tube
摘要
申请公布号
US1971447(A)
申请公布日期
1934.08.28
申请号
US19300436010
申请日期
1930.03.15
申请人
RADIO CORPORATION OF AMERICA
发明人
GROENEVELD YME BOUWINUS FOLKERT JAN;OOSTERHUIS EKKO
分类号
H01J19/66;H01J19/82
主分类号
H01J19/66
代理机构
代理人
主权项
地址
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