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发明名称
Vacuum tube seal-off
摘要
申请公布号
US2278500(A)
申请公布日期
1942.04.07
申请号
US19410376811
申请日期
1941.01.31
申请人
RADIO CORPORATION OF AMERICA
发明人
SMITH NEWELL R.
分类号
H01J9/40
主分类号
H01J9/40
代理机构
代理人
主权项
地址
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