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发明名称
Vacuum valve
摘要
申请公布号
US2615670(A)
申请公布日期
1952.10.28
申请号
US19480013431
申请日期
1948.03.06
申请人
RADIO CORPORATION OF AMERICA
发明人
NELSON HERBERT
分类号
F16K7/20
主分类号
F16K7/20
代理机构
代理人
主权项
地址
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