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发明名称
Vacuum tube
摘要
申请公布号
US2049226(A)
申请公布日期
1936.07.28
申请号
US19270222696
申请日期
1927.09.29
申请人
RADIO CORPORATION
发明人
ROBERTS WALTER VAN B.
分类号
H04B15/00
主分类号
H04B15/00
代理机构
代理人
主权项
地址
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